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Thread: Help understanding GA-EP45-UD3R BIOS settings & Core2 FSB OC principles




  1. #21
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    Default Re: Help understanding GA-EP45-UD3R BIOS settings & Core2 FSB OC principles

    Ok, the 2.66D memory multiplier must just be severely broken. That's the only conclusion I can come to. I have progressively raised voltages and loosened timings beyond all reason and the thing still will not POST!

    This was the configuration when I finally gave up.

    Code:
    MB Intelligent Tweaker(M.I.T.)
    Robust Graphics Booster ................: Auto
    CPU Clock Ratio ........................: 6.0
    Fine CPU Clock Ratio....................:+0.0
    CPU Frequency ..........................: 2.40GHz
    
    Clock Chip Control 
    Standard Clock Control
    CPU Host Clock Control..................: [Enabled] 
    CPU Host Frequency (Mhz) ...............: 400 Mhz
    PCI Express Frequency (Mhz) ............: 100
    C.I.A.2 ................................: [Disabled]
    
    
    Advanced Clock Control [Press Enter]
    CPU Clock Drive.........................: 800mV
    PCI Express Clock Drive.................: 900mV
    CPU Clock Skew (ps).....................: 0ps
    MCH Clock Skew (ps).....................: 0ps
    
    DRAM Performance Control
    Performance Enhance.....................: [STANDARD]
    Extreme Memory Profile (X.M.P.).........: Disabled
    (G)MCH Frequency Latch..................: 400
    System Memory Multiplier ...............: 2.66D
    Memory Frequency (Mhz) .................: 1066
    DRAM Timing Selectable .................: [Manual]
    
    Standard Timing Control
    CAS Latency Time........................: 7
    tRCD ...................................: 7
    tRP.....................................: 7
    tRAS....................................: 20
    
    Advanced Timing Control
    tRRD....................................: Auto (4)
    tWTR....................................: Auto (4)
    tWR.....................................: Auto (8)
    tRFC....................................: Auto (68)
    tRTP....................................: Auto (4)
    Command Rate (CMD) .....................: 2
    
    Driving Strength Profiles
    Driving Strength .......................: 1066
    
    Channel A
    Static tRead Value......................: 12
     tRD Phase0 Adjustment..................: Auto
    tRD Phase1 Adjustment...................: Auto
     tRD Phase2 Adjustment .................: Auto
     tRD Phase3 Adjustment..................: Auto
    Trd2rd(Different Rank)..................: Auto 
    Twr2wr(Different Rank)..................: Auto 
    Twr2rd(Different Rank)..................: Auto 
    Trd2wr(Same/Diff Rank)..................: Auto 
    Dimm1 Clock Skew Control................: Auto
    Dimm2 Clock Skew Control................: Auto
    
    Channel B
    Static tRead Value......................: 12
     tRD Phase0 Adjustment..................: Auto
    tRD Phase1 Adjustment...................: Auto
     tRD Phase2 Adjustment .................: Auto
     tRD Phase3 Adjustment..................: Auto
    Trd2rd(Different Rank)..................: Auto 
    Twr2wr(Different Rank)..................: Auto 
    Twr2rd(Different Rank)..................: Auto 
    Trd2wr(Same/Diff Rank)..................: Auto 
    Dimm1 Clock Skew Control................: Auto
    Dimm2 Clock Skew Control................: Auto
    
    Motherboard Voltage Control
    Voltage Type.............:Manual
    CPU
    CPU Vcore...............................: 1.3000V
    CPU Termination.........................: 1.280V
    CPU PLL.................................: 1.500V
    CPU Referen.............................: Auto (0.760V)
    
    
    MCH/ICH
    MCH Core..................1.100V........: 1.340V
    MCH Reference.............0.800V........: 0.850V
    MCH/DRAM Ref..............0.900V........: Auto (0.900V)
    ICH I/O...................1.550V........: Auto (1.500V)
    ICH Core..................1.100V........: Auto (1.100V)
    
    DRAM
    DRAM Voltage .............1.800V........: 2.10V
    DRAM Termination .........0.900V........: Auto (0.900V)
    Channel A Reference ......0.900V........: Auto (0.900V)
    Channel B Reference ......0.900V........: Auto (0.900V)
    
    Advanced Settings
    Limit CPUID Max. to 3...................: [Disabled]
    No-Execute Memory Protect...............: [Enabled]
    CPU Enhanced Halt (C1E).................: [Disabled]
    C2/C2E State Support....................: [Disabled]
    x C4/C4E State Support..................: [Disabled]
    CPU Thermal Monitor 2(TM2) .............: [Enabled]
    CPU EIST Function.......................: [Disabled]
    Virtualization Technology...............: [Disabled]
    I guess I will have to give up on the 400MHz strap with a 3:4 ratio. I will proceed with the 2.66C (200MHz strap) 3:4 ratio, which actually boots, and see what I can do.
    Last edited by Dalamar; 02-24-2009 at 11:22 AM. Reason: Clarification
    CPU: Q9550 @ 3.4GHz (400x8.5, 1.300V, ZeroTherm FZ120 heatsink)
    Motherboard: Gigabyte GA-EP45-UD3R PCB v1.1, BIOS F13e (modified)
    RAM: 8GB (2x2GB Corsair TWIN2X4096-8500C5D, 2x2GB OCZ 2P1066LV2G, 1.9V 4-4-4-12 @ 400MHz)
    Video: Sapphire Radeon HD7870 2GB
    Audio: SB X-Fi Platinum PCI (in PCI3)
    HD: SanDisk Extreme II 240GB SSD
    Optical: LiteOn iHAS124B DVD+/-RW
    PSU: PC Power & Cooling Silencer 750W S75QB
    Case: LianLi PC-61 USB (2x 80mm lower front intake, 80mm blowhole, 80mm rear exhaust, and 80mm exhaust in PSU)

  2. #22
    kick's Avatar
    kick is offline Senior Member
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    Default Re: Help understanding GA-EP45-UD3R BIOS settings & Core2 FSB OC principles

    Did you check this out?
    wish my cpu would run 3.6 at stock :(
    http://forums.tweaktown.com/f69/stab...oltages-30561/
    Current Systems:

    Asrock p67 Extreme6.............. Gigabyte EP-45 UD3 ...................... Gigabyte 73 PVM S2
    Intel i5 2500k 4.8ghz................ Intel Q8400 3.8ghz......................... Intel D820 2.8ghz
    Zalman 10x cooler.................... Coolermaster V8............................ HP cooler
    8GB Gskill ripjaw ddr3.............. 4GB Gskill PI ddr2.......................... 4GB samsung ddr2
    60GB ssd/500GB HDD .............. WD 1TB hdd.................................... Seagate 160GB hdd
    GTX 460 1GB x2 SLI ................. Msi 9600GT 512MB(died) ........... Onboard gx
    Win7 64 ,750w psu(ocz)............ Win7 64 ,520w psu,seasonic...... Win XP pro ,400w psu

    HEC 6A34 case . ....................... Jeantec R2 case............................ Packard Bell case

    hoping to upgrade to http://www.thinkgeek.com/stuff/41/habicase.shtml
    http://www.flixya.com/video/140325/Animal-launching

  3. #23
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    Feb 2009
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    Post Re: Help understanding GA-EP45-UD3R BIOS settings & Core2 FSB OC principles

    Quote Originally Posted by Dalamar View Post
    Ok, the 2.66D memory multiplier must just be severely broken. That's the only conclusion I can come to. I have progressively raised voltages and loosened timings beyond all reason and the thing still will not POST!

    This was the configuration when I finally gave up.

    Code:
    MB Intelligent Tweaker(M.I.T.)
    Robust Graphics Booster ................: Auto
    CPU Clock Ratio ........................: 6.0 <<<<< This is maybe too low?!
    MCH calculated effective FSB 600MHz!
    See this
      
    and explanations The Tech Repository Forums - View Single Post - Secrets of the i965 based Asus P5B and chipset strap uncovered.
    (I guess 8 (8,5) would/should be good 9/8*400=450MHz NBCC) 
    Fine CPU Clock Ratio....................:+0.0
    CPU Frequency ..........................: 2.40GHz
    
    Clock Chip Control 
    Standard Clock Control
    CPU Host Clock Control..................: [Enabled] 
    CPU Host Frequency (Mhz) ...............: 400 Mhz
    PCI Express Frequency (Mhz) ............: 100
    C.I.A.2 ................................: [Disabled]
    
    
    Advanced Clock Control [Press Enter]
    CPU Clock Drive.........................: 800mV
    PCI Express Clock Drive.................: 900mV
    CPU Clock Skew (ps).....................: 0ps
    MCH Clock Skew (ps).....................: 0ps
    
    DRAM Performance Control
    Performance Enhance.....................: [STANDARD]
    Extreme Memory Profile (X.M.P.).........: Disabled
    (G)MCH Frequency Latch..................: 400
    System Memory Multiplier ...............: 2.66D
    Memory Frequency (Mhz) .................: 1066
    DRAM Timing Selectable .................: [Manual]
    
    Standard Timing Control
    CAS Latency Time........................: 7 <<<<< 5-5-5-15 should be good 
    for your RAM according to specification
    tRCD ...................................: 7
    tRP.....................................: 7
    tRAS....................................: 20
    
    Advanced Timing Control
    tRRD....................................: Auto (4)
    tWTR....................................: Auto (4)
    tWR.....................................: Auto (8)
    tRFC....................................: Auto (68)
    tRTP....................................: Auto (4)
    Command Rate (CMD) .....................: 2
    
    Driving Strength Profiles
    Driving Strength .......................: 1066 
    
    Channel A
    Static tRead Value......................: 12 <<< if above settings POST and you 
    can boot, it can be lowered definitely down to 6 !
    (both channels at once of course) use Memset and do not save only apply and test then!
      tRD Phase0 Adjustment..................: Auto
    tRD Phase1 Adjustment...................: Auto
     tRD Phase2 Adjustment .................: Auto
     tRD Phase3 Adjustment..................: Auto
    Trd2rd(Different Rank)..................: Auto 
    Twr2wr(Different Rank)..................: Auto 
    Twr2rd(Different Rank)..................: Auto 
    Trd2wr(Same/Diff Rank)..................: Auto 
    Dimm1 Clock Skew Control................: Auto
    Dimm2 Clock Skew Control................: Auto
    
    Channel B
    Static tRead Value......................: 12
     tRD Phase0 Adjustment..................: Auto
    tRD Phase1 Adjustment...................: Auto
     tRD Phase2 Adjustment .................: Auto
     tRD Phase3 Adjustment..................: Auto
    Trd2rd(Different Rank)..................: Auto 
    Twr2wr(Different Rank)..................: Auto 
    Twr2rd(Different Rank)..................: Auto 
    Trd2wr(Same/Diff Rank)..................: Auto 
    Dimm1 Clock Skew Control................: Auto
    Dimm2 Clock Skew Control................: Auto
    
    Motherboard Voltage Control
    Voltage Type.............:Manual
    CPU
    CPU Vcore...............................: 1.3000V
    CPU Termination.........................: 1.280V
    CPU PLL.................................: 1.500V
    CPU Referen.............................: Auto (0.760V)
    
    
    MCH/ICH
    MCH Core..................1.100V........: 1.340V
    MCH Reference.............0.800V........: 0.850V
    MCH/DRAM Ref..............0.900V........: Auto (0.900V)
    ICH I/O...................1.550V........: Auto (1.500V)
    ICH Core..................1.100V........: Auto (1.100V)
    
    DRAM
    DRAM Voltage .............1.800V........: 2.10V 
    DRAM Termination .........0.900V........: Auto (0.900V)
    Channel A Reference ......0.900V........: Auto (0.900V)
    Channel B Reference ......0.900V........: Auto (0.900V)
    
    Advanced Settings
    Limit CPUID Max. to 3...................: [Disabled]
    No-Execute Memory Protect...............: [Enabled]
    CPU Enhanced Halt (C1E).................: [Disabled]
    C2/C2E State Support....................: [Disabled]
    x C4/C4E State Support..................: [Disabled]
    CPU Thermal Monitor 2(TM2) .............: [Enabled]
    CPU EIST Function.......................: [Disabled]
    Virtualization Technology...............: [Disabled]
    I guess I will have to give up on the 400MHz strap with a 3:4 ratio. I will proceed with the 2.66C (200MHz strap) 3:4 ratio, which actually boots, and see what I can do.
    You should always look after the equations if you change anything like MCH FSB and tRD-tCL
    explanation: AnandTech: ASUS ROG Rampage Formula: Why we were wrong about the Intel X48

  4. #24
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    Default Re: Help understanding GA-EP45-UD3R BIOS settings & Core2 FSB OC principles

    Once again, vacapp to the rescue!

    I realize the tRD was set very high. The reason I had used 12 was because I was trying to loosen things as much as possible in an attempt to get 2.66D to work. I realize I can eventually bring tRD much lower (my target will be ~6-7). Similarly for the general memory timings. I know my RAM is rated at 5-5-5-15. I had loosened the timings to 7-7-7-20 as I was just trying to get 2.66D to work at all.

    I did not know that was how the northbridge derived its default operating clock. I wonder if the strap has an influence on it as well? I ask because I found that that the following configuration seems to work fine, and passed more than 8 hours of Memtest86+ looping last night. This has the same CPU multiplier and the same FSB (and much lower voltages all around). The only other difference is that it uses the 2.66 "C" multiplier (from the 200MHz strap set) instead of the 2.66 "D" multiplier (from the 400MHz strap set).

    Code:
    MB Intelligent Tweaker(M.I.T.)
    Robust Graphics Booster ................: Auto
    CPU Clock Ratio ........................: 6.0
    Fine CPU Clock Ratio....................:+0.0
    CPU Frequency ..........................: 2.40GHz
    
    Clock Chip Control 
    Standard Clock Control
    CPU Host Clock Control..................: [Enabled]
    CPU Host Frequency (Mhz) ...............: 400 Mhz
    PCI Express Frequency (Mhz) ............: 100
    C.I.A.2 ................................: [Disabled]
    
    
    Advanced Clock Control [Press Enter]
    CPU Clock Drive.........................: 800mV
    PCI Express Clock Drive.................: 900mV
    CPU Clock Skew (ps).....................: 0ps
    MCH Clock Skew (ps).....................: 0ps
    
    DRAM Performance Control
    Performance Enhance.....................: [STANDARD]
    Extreme Memory Profile (X.M.P.).........: Disabled
    (G)MCH Frequency Latch..................: Auto
    System Memory Multiplier ...............: 2.66C
    Memory Frequency (Mhz) .................: 1066
    DRAM Timing Selectable .................: [Manual]
    
    Standard Timing Control
    CAS Latency Time........................: 5
    tRCD ...................................: 5
    tRP.....................................: 5
    tRAS....................................: 15
    
    Advanced Timing Control
    tRRD....................................: Auto (4)
    tWTR....................................: Auto (4)
    tWR.....................................: Auto (8)
    tRFC....................................: Auto (68)
    tRTP....................................: Auto (4)
    Command Rate (CMD) .....................: Auto (0)
    
    Driving Strength Profiles
    Driving Strength .......................: 1066
    
    Channel A
    Static tRead Value......................: 7
     tRD Phase0 Adjustment..................: Auto
    tRD Phase1 Adjustment...................: Auto
     tRD Phase2 Adjustment .................: Auto
     tRD Phase3 Adjustment..................: Auto
    Trd2rd(Different Rank)..................: Auto
    Twr2wr(Different Rank)..................: Auto
    Twr2rd(Different Rank)..................: Auto
    Trd2wr(Same/Diff Rank)..................: Auto
    Dimm1 Clock Skew Control................: Auto
    Dimm2 Clock Skew Control................: Auto
    
    Channel B
    Static tRead Value......................: 7
     tRD Phase0 Adjustment..................: Auto
    tRD Phase1 Adjustment...................: Auto
     tRD Phase2 Adjustment .................: Auto
     tRD Phase3 Adjustment..................: Auto
    Trd2rd(Different Rank)..................: Auto
    Twr2wr(Different Rank)..................: Auto
    Twr2rd(Different Rank)..................: Auto
    Trd2wr(Same/Diff Rank)..................: Auto
    Dimm1 Clock Skew Control................: Auto
    Dimm2 Clock Skew Control................: Auto
    
    Motherboard Voltage Control
    Voltage Type.............:Manual
    CPU
    CPU Vcore...............................: 1.2500V
    CPU Termination.........................: 1.200V
    CPU PLL.................................: 1.500V
    CPU Reference...........................: Auto (0.760V)
    
    MCH/ICH
    MCH Core..................1.100V........: 1.200V
    MCH Reference.............0.800V........: Auto (0.760V)
    MCH/DRAM Ref..............0.900V........: Auto (0.900V)
    ICH I/O...................1.550V........: Auto (1.500V)
    ICH Core..................1.100V........: Auto (1.100V)
    
    DRAM
    DRAM Voltage .............1.800V........: 2.10V
    DRAM Termination .........0.900V........: Auto (0.900V)
    Channel A Reference ......0.900V........: Auto (0.900V)
    Channel B Reference ......0.900V........: Auto (0.900V)
    
    Advanced Settings
    Limit CPUID Max. to 3...................: [Disabled]
    No-Execute Memory Protect...............: [Enabled]
    CPU Enhanced Halt (C1E).................: [Disabled]
    C2/C2E State Support....................: [Disabled]
    x C4/C4E State Support..................: [Disabled]
    CPU Thermal Monitor 2(TM2) .............: [Enabled]
    CPU EIST Function.......................: [Disabled]
    Virtualization Technology...............: [Disabled]
    In principle, shouldn't this be setting the same NB core clock of (9/6) * 400 = 600MHz? And yet this configuration appears to work without issue.

    I will have to fire up Sandra when I get home and check on the NB operating frequency to see what it's actually doing.

    I wish I had complete information on everything that was actually being adjusted when selecting different straps. It would go a long way toward making this easier!
    Last edited by Dalamar; 02-25-2009 at 01:46 AM. Reason: Correction
    CPU: Q9550 @ 3.4GHz (400x8.5, 1.300V, ZeroTherm FZ120 heatsink)
    Motherboard: Gigabyte GA-EP45-UD3R PCB v1.1, BIOS F13e (modified)
    RAM: 8GB (2x2GB Corsair TWIN2X4096-8500C5D, 2x2GB OCZ 2P1066LV2G, 1.9V 4-4-4-12 @ 400MHz)
    Video: Sapphire Radeon HD7870 2GB
    Audio: SB X-Fi Platinum PCI (in PCI3)
    HD: SanDisk Extreme II 240GB SSD
    Optical: LiteOn iHAS124B DVD+/-RW
    PSU: PC Power & Cooling Silencer 750W S75QB
    Case: LianLi PC-61 USB (2x 80mm lower front intake, 80mm blowhole, 80mm rear exhaust, and 80mm exhaust in PSU)

  5. #25
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    Default Re: Help understanding GA-EP45-UD3R BIOS settings & Core2 FSB OC principles

    Quote Originally Posted by kick View Post
    Did you check this out?
    wish my cpu would run 3.6 at stock :(
    http://forums.tweaktown.com/f69/stab...oltages-30561/
    Thanks, Kick. After reading that I tried using that same configuration, and even using some boosted voltages, but still had no luck at 401MHz FSB with the D strap and multiplier.

    But I appreciate the tip nonetheless!
    CPU: Q9550 @ 3.4GHz (400x8.5, 1.300V, ZeroTherm FZ120 heatsink)
    Motherboard: Gigabyte GA-EP45-UD3R PCB v1.1, BIOS F13e (modified)
    RAM: 8GB (2x2GB Corsair TWIN2X4096-8500C5D, 2x2GB OCZ 2P1066LV2G, 1.9V 4-4-4-12 @ 400MHz)
    Video: Sapphire Radeon HD7870 2GB
    Audio: SB X-Fi Platinum PCI (in PCI3)
    HD: SanDisk Extreme II 240GB SSD
    Optical: LiteOn iHAS124B DVD+/-RW
    PSU: PC Power & Cooling Silencer 750W S75QB
    Case: LianLi PC-61 USB (2x 80mm lower front intake, 80mm blowhole, 80mm rear exhaust, and 80mm exhaust in PSU)

  6. #26
    Lsdmeasap's Avatar
    Lsdmeasap is offline GIGABYTE Guru
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    Default Re: Help understanding GA-EP45-UD3R BIOS settings & Core2 FSB OC principles

    Did you ever try 399 or 401 FSB instead of 400 Exact, this can cause issues.

    That is a interesting article linked above, but I am not so sure it applies to P35/45 as I have used the 2.66 Multi with 6x CPU without issue

  7. #27
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    Default Re: Help understanding GA-EP45-UD3R BIOS settings & Core2 FSB OC principles

    Quote Originally Posted by Lsdmeasap View Post
    Did you ever try 399 or 401 FSB instead of 400 Exact, this can cause issues.

    That is a interesting article linked above, but I am not so sure it applies to P35/45 as I have used the 2.66 Multi with 6x CPU without issue
    Thank you for the reply!

    I tried 401 last night (it didn't work, see my reply to Kick), but not 399. I will try that this evening.

    Do you know what differences the straps make besides determining the automatic settings for tRD? I'm having a lot of trouble, as the strap setting seems very much like a "black box", requiring brute force trial and error to get anything working.

    If I had a better idea of the specific differences that were caused by using a particular strap it would help very much to narrow down what I need to adjust to achieve stability. Otherwise I'm sort of throwing adjustments at the system at random.

    And I'm still really confused why 2.66D won't work at all when it's supposedly the correct strap for 400MHz FSB, but 2.66C works great at 400MHz when it's supposedly the 200MHz FSB strap!
    Last edited by Dalamar; 02-25-2009 at 02:51 AM.
    CPU: Q9550 @ 3.4GHz (400x8.5, 1.300V, ZeroTherm FZ120 heatsink)
    Motherboard: Gigabyte GA-EP45-UD3R PCB v1.1, BIOS F13e (modified)
    RAM: 8GB (2x2GB Corsair TWIN2X4096-8500C5D, 2x2GB OCZ 2P1066LV2G, 1.9V 4-4-4-12 @ 400MHz)
    Video: Sapphire Radeon HD7870 2GB
    Audio: SB X-Fi Platinum PCI (in PCI3)
    HD: SanDisk Extreme II 240GB SSD
    Optical: LiteOn iHAS124B DVD+/-RW
    PSU: PC Power & Cooling Silencer 750W S75QB
    Case: LianLi PC-61 USB (2x 80mm lower front intake, 80mm blowhole, 80mm rear exhaust, and 80mm exhaust in PSU)

  8. #28
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    Lightbulb Re: Help understanding GA-EP45-UD3R BIOS settings & Core2 FSB OC principles

    Quote Originally Posted by Dalamar View Post
    Once again, vacapp to the rescue!

    I realize the tRD was set very high. The reason I had used 12 was because I was trying to loosen things as much as possible in an attempt to get 2.66D to work. I realize I can eventually bring tRD much lower (my target will be ~6-7). Similarly for the general memory timings. I know my RAM is rated at 5-5-5-15. I had loosened the timings to 7-7-7-20 as I was just trying to get 2.66D to work at all.

    I did not know that was how the northbridge derived its default operating clock. I wonder if the strap has an influence on it as well? I ask because I found that that the following configuration seems to work fine, and passed more than 8 hours of Memtest86+ looping last night. This has the same CPU multiplier and the same FSB (and much lower voltages all around). The only other difference is that it uses the 2.66 "C" multiplier (from the 200MHz strap set) instead of the 2.66 "D" multiplier (from the 400MHz strap set).

    In principle, shouldn't this be setting the same NB core clock of (9/6) * 400 = 600MHz? And yet this configuration appears to work without issue.

    I will have to fire up Sandra when I get home and check on the NB operating frequency to see what it's actually doing.
    See, I am far not an expert I only found some guides and I try to be familiar with them to find a solution for my own problem. It is weird, it should be work with the 2.66D strap and if am right, because of better bandwidth gives a better overall result after benchmarking (). Furthermore it is not impossible to have a big NBCC, it only means it can be responsible for a POST failure.
    I do not know whether straps have a connection to NBCC...
    I wish I had complete information on everything that was actually being adjusted when selecting different straps. It would go a long way toward making this easier!
    The detailed explanation of straps besides of Anandtech's guide, is this article, I already mentioned in my own thread, take a look:
    Secrets of the i965 based Asus P5B and chipset strap uncovered. - The Tech Repository Forums
    After checking you could tell your thoughts, whether you ve found your answer. I am really not sure if I understood it exactly how it works. :D
    Unfortunatelly, an old article, but maybe some theory remained the same regarding straps (???):
    Intel 975 chipset strap/overclocking guide. - OCZ Forum


    Let's take a look for a theoretical example (DDR2-1064 like you and maybe -FSB 399-400-401 nevermind- both straps work):
    - default meaning 200MHz strap has better latency as the 400MHz, but less bandwidth
    - but what is then with NBCC as you mentioned? Regardless the 200MHz strap, because of the calculated NBCC FSB (should be more relevant... ?) same bandwidth performance?
    - does it mean you can have a much better tRD and same bandwidth, so the 200MHz strap gives a better overall system performance ?????
    Last edited by vacapp; 02-26-2009 at 04:42 PM. Reason: I AM STILL WONDERING ... :D

  9. #29
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    Default Re: Help understanding GA-EP45-UD3R BIOS settings & Core2 FSB OC principles

    You know, I think I was making some incorrect assumptions about how my Corsair RAM could perform. After reading this review at TechPowerUp, it looks like there's a very good chance I can run 4-4-4-12 at around 500MHz (DDR2 1000). I had just assumed it wouldn't be able to do that speed without resorting to CL5.

    If my modules can indeed manage DDR2-1000 with CL4 at 2.1V, I think I'll just go with the Anandtech recommended setting of 400MHz FSB with a 5:4 ratio (the 2.50A multiplier in the EP45-UD3R BIOS) and see if I can crank tRD down to 5 and maintain stability.

    It looks like that will give me the best performance balance overall, and allow me to stop worrying about the weirdness of the 2.66D vs 2.66C multipliers anyway.

    It would also enable me to keep most everything at/near stock speed and voltages, with the exception of the MCH which will likely need a bit of vcore boost to do tRD 5. That fits my comfort level and intentions best anyway, as I'm not into running things significantly outside their ratings.

    I will report back after I have done further testing along these lines.
    CPU: Q9550 @ 3.4GHz (400x8.5, 1.300V, ZeroTherm FZ120 heatsink)
    Motherboard: Gigabyte GA-EP45-UD3R PCB v1.1, BIOS F13e (modified)
    RAM: 8GB (2x2GB Corsair TWIN2X4096-8500C5D, 2x2GB OCZ 2P1066LV2G, 1.9V 4-4-4-12 @ 400MHz)
    Video: Sapphire Radeon HD7870 2GB
    Audio: SB X-Fi Platinum PCI (in PCI3)
    HD: SanDisk Extreme II 240GB SSD
    Optical: LiteOn iHAS124B DVD+/-RW
    PSU: PC Power & Cooling Silencer 750W S75QB
    Case: LianLi PC-61 USB (2x 80mm lower front intake, 80mm blowhole, 80mm rear exhaust, and 80mm exhaust in PSU)

  10. #30
    Join Date
    Feb 2009
    Posts
    42

    Default Re: Help understanding GA-EP45-UD3R BIOS settings & Core2 FSB OC principles

    Well, I couldn't get CAS 4 working with 4:5 (2.50A) for 500MHz (DDR2-1000). So I settled on what seems to be the working 3:4 (2.66C) multiplier with CAS 5 for 533MHz (DDR2-1066).

    It appears the MCH bus speed issue raised by vacapp may be true. When I boot using 400MHz FSB with a 6.0x multiplier Sandra shows the northbridge frequency as "4x 600MHz" for a total of 2400MHz. When I boot with 400MHz FSB and a 9.0x multiplier Sandra shows "4x 400MHz" for a total of 1600MHz. I'm not sure if this is a real difference or just an incorrect detection/reporting issue for the SiSoft Sandra software.

    In any case, seems that my E8400 may also be happy at 3.60GHz at stock voltage. I will try a Prime95 run on blend overnight, but these settings work for several passes of Memtest86+ tests 5 and 8.

    I was able to crank the tRD down to 6 in this configuration after increasing the MCH core voltage to 1.260V. It can also do tRD 7 at 1.200V MCH, and perhaps even lower voltage, but I've not tested to find the lowest stable for tRD 7 as I'd rather stay at 6. Sandra reports a combined memory latency of 69ns for the tRD 6 setup.

    Code:
    Robust Graphics Booster................: Auto
    CPU Clock Ratio........................: 9
    Fine CPU Clock Ratio...................: +0.0
    CPU Frequency..........................: 3.60GHz
    
    Clock Chip Control 
    Standard Clock Control
    CPU Host Clock Control.................: Enabled
    CPU Host Frequency (Mhz)...............: 400Mhz
    PCI Express Frequency (Mhz)............: 100
    C.I.A.2 ...............................: [Disabled]
    
    Advanced Clock Control [Press Enter]
    CPU Clock Drive........................: 800mV
    PCI Express Clock Drive................: 900mV
    CPU Clock Skew (ps)....................:   0ps
    MCH Clock Skew (ps)....................:   0ps
    
    DRAM Performance Control
    Performance Enhance....................: STANDARD
    Extreme Memory Profile (X.M.P.)........: Disabled
    (G)MCH Frequency Latch.................: Auto
    System Memory Multiplier...............: 2.66C 
    Memory Frequency (Mhz).................: 1066
    DRAM Timing Selectable.................: Manual
    
    Standard Timing Control
    CAS Latency Time.......................: 5
    tRCD...................................: 5
    tRP....................................: 5
    tRAS...................................: 15
    
    Advanced Timing Control
    tRRD...................................: Auto (4)
    tWTR...................................: Auto (4)
    tWR....................................: Auto (8)
    tRFC...................................: Auto (68)
    tRTP...................................: Auto (4)
    Command Rate (CMD) ....................: Auto (0)
    
    Driving Strength Profiles
    Driving Strength ......................: 1066
    
    Data Driving Pull-Up Level.............: Auto
    Cmd Driving Pull-Up Level..............: Auto
    Ctrl Driving Pull-Up Level.............: Auto
    Clk Driving Pull-Up Level..............: Auto
    
    Data Driving Pull-Down Level ..........: Auto
    Cmd Driving Pull-Down Level ...........: Auto
    Ctrl Driving Pull-Down Level ..........: Auto
    Clk Driving Pull-Down Level ...........: Auto
    
    Channel A
    Static tRead Value.....................: 6
    tRD Phase0 Adjustment..................: Auto (1)
    tRD Phase1 Adjustment..................: Auto (1)
    tRD Phase2 Adjustment..................: Auto (0)
    tRD Phase3 Adjustment..................: Auto (0)
    
    Trd2rd(Different Rank).................: Auto (8)
    Twr2wr(Different Rank).................: Auto (8)
    Twr2rd(Different Rank).................: Auto (7)
    Trd2wr(Same/Diff Rank).................: Auto (9)
    
    Dimm1 Clock Skew Control...............: Auto
    Dimm2 Clock Skew Control...............: Auto
    DDR Write Training.....................: Auto
    
    Channel B
    Static tRead Value.....................: 6
    tRD Phase0 Adjustment..................: Auto (0)
    tRD Phase1 Adjustment..................: Auto (0)
    tRD Phase2 Adjustment..................: Auto (0)
    tRD Phase3 Adjustment..................: Auto (0)
    
    Trd2rd(Different Rank).................: Auto (8)
    Twr2wr(Different Rank).................: Auto (8)
    Twr2rd(Different Rank).................: Auto (7)
    Trd2wr(Same/Diff Rank).................: Auto (9)
    
    Dimm1 Clock Skew Control...............: Auto
    Dimm2 Clock Skew Control...............: Auto
    DDR Write Training.....................: Auto
    
    Motherboard Voltage Control
    Voltage Type...........................: [Manual]
    
    CPU---------------------Normal-----------Current
    
    Load Line Calibration..................: [Disabled]
    CPU Vcore...............1.25000V.......: 1.25000V
    CPU Termination.........1.200V.........: 1.200V
    CPU PLL.................1.500V.........: 1.500V
    CPU Reference...........0.760V.........: Auto  
    
    MCH/ICH
    MCH Core................1.100V.........: 1.260V
    MCH Reference...........0.760V.........: Auto
    MCH/DRAM Reference......0.900V.........: Auto
    ICH I/O.................1.500V.........: Auto
    ICH Core................1.100V.........: Auto
    
    DRAM
    DRAM Voltage............1.800V.........: 2.100V 
    DRAM Termination........0.900V.........: Auto
    Channel A Reference.....0.900V.........: Auto
    Channel B Reference.....0.900V.........: Auto
    
    Advanced Settings
    Limit CPUID Max. to 3..................: [Disabled]
    No-Execute Memory Protect..............: [Enabled]
    CPU Enhanced Halt (C1E)................: [Disabled]
    C2/C2E State Support...................: [Disabled]
    x C4/C4E State Support.................: [Disabled]
    CPU Thermal Monitor 2(TM2) ............: [Enabled]
    CPU EIST Function......................: [Disabled]
    Virtualization Technology..............: [Disabled]
    
    Integrated Peripherals
    Legacy USB Storage Detect .............: [Disabled]
    At this point I could use any advice about further tweaking the advanced memory timings.

    Also, is there any reason to worry about running the MCH core at 1.260V for 24/7 operation with the stock EP45-UD3R v1.1 chipset cooling?
    Last edited by Dalamar; 02-25-2009 at 05:43 PM.
    CPU: Q9550 @ 3.4GHz (400x8.5, 1.300V, ZeroTherm FZ120 heatsink)
    Motherboard: Gigabyte GA-EP45-UD3R PCB v1.1, BIOS F13e (modified)
    RAM: 8GB (2x2GB Corsair TWIN2X4096-8500C5D, 2x2GB OCZ 2P1066LV2G, 1.9V 4-4-4-12 @ 400MHz)
    Video: Sapphire Radeon HD7870 2GB
    Audio: SB X-Fi Platinum PCI (in PCI3)
    HD: SanDisk Extreme II 240GB SSD
    Optical: LiteOn iHAS124B DVD+/-RW
    PSU: PC Power & Cooling Silencer 750W S75QB
    Case: LianLi PC-61 USB (2x 80mm lower front intake, 80mm blowhole, 80mm rear exhaust, and 80mm exhaust in PSU)

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