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Thread: Help me OC my E8400




  1. #1
    Join Date
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    Default Help me OC my E8400

    Hey friends. I recently upgraded my watercooling to accommodate the NB and MB VRs. I had my E8400 running 3.8ghz but the NB seemed way too hot and I stopped there. Now the OC journey continues. I want to reach the highest possible overclock for 24/7. I want to push this setup until either temps or voltages are unacceptable for 24/7 use.

    Specs are as follows
    E8400 E0
    Gigabyte GA-EP45-UD3R (pretty much the same as ud3p)
    Corsair Dominator 2x2gb 1066 5-6-6-18 (2.1v)
    MSI GTX275 Twinfrozr OC edition
    2x WD Caviar 160gb sata in RAID 0 on PCIe 1x Raid card
    OCZ Gamextreme 700w psu

    Cooling is as follows:
    Fittings and tubing are 3/8"
    Rad: HWlabs BlackIce Alpha Micro II (2x 80mm fan)
    Fans: 2x Silverstone RL-FM81 (72.91CFM each)
    CPU block: Original Swiftech Apogee
    NB block: Swiftech MCW30
    VR blocks: Koolance MVR40
    Pump: Switech/Laing MCP350 with pressure bypass
    Case Fans: 1 intake and 1 exhaust 120mm Fans

    Temps so far have not been a problem. With the fans on lowest speeds idle is around 34c load is around 50c.

    I am not too familiar with some of these voltages and have been researching them for 2 days now only to come up with alot of contradictory information. I will post my bios settings and we can go from there. All my current settings are below in the quote box. Thanks for any and all help.





    Quote:
    <table width="100%" border="0" cellpadding="6" cellspacing="0"><tbody><tr><td class="alt2" style="border: 1px inset ;"> MB Intelligent Tweaker(M.I.T.)
    Robust Graphics Booster ...............: Auto
    CPU Clock Ratio ..........................: 9x
    Fine CPU Clock Ratio.....................:.0
    CPU Frequency ...........................: 4.14ghz


    Clock Chip Control
    Standard Clock Control
    CPU Host Clock Control..................: [Enabled]
    CPU Host Frequency (Mhz) ............: 460Mhz
    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...............: 400mhz
    System Memory Multiplier ..............: 2.00D

    Memory Frequency (Mhz) ..............: 920Mhz
    DRAM Timing Selectable ................: [Manual]

    Standard Timing Control
    CAS Latency Time........................5
    tRCD .........................................6
    tRP'...........................................6
    tRAS..........................................18

    Advanced Timing Control
    tRRD........................................... [Auto]
    tWTR.......................................... [Auto]
    tWR............................................ [Auto]
    tRFC........................................... [Auto]
    tRTP........................................... [Auto]
    Command Rate (CMD) ................... [Auto]

    Motherboard Voltage Control
    Load Line Calibration.....................: Enabled

    CPU
    CPU Vcore….……….........................: 1.325v (Please keep in mind that I have cranked this way up to eliminate Vcore as a possibility for instability, this chip has a 1.25 VID but will run stock clocks at 1.1v)
    CPU Termination…..... 1.200V*.......: 1.2v
    CPU PLL…………………....1.500V*.......: 1.35v
    CPU Referen.…………....0.755V*.......: 0.760v

    MCH/ICH
    MCH Core…………….....1.100V...........: 1.220v
    MCH Reference….…….0.800V...........; 0.760v
    MCH/DRAM Ref.…......0.900V...........: 0.900v
    ICH I/O……………….....1.500V............: 1.5v
    ICH Core…………...……1.100V............: 1.1v

    DRAM
    DRAM Voltage ……....1.800V............: 2.1
    DRAM Termination .…0.900V............: 0.9v
    Channel A Reference 0.900V............: 0.9v
    Channel B Reference 0.900V............: 0.9v

    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................: [Enabled] </td></tr></tbody></table>

  2. #2
    Chike is offline Senior Member
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    Default Re: Help me OC my E8400

    Which voltages you are intersted of?
    Some of them are derived from others and should be set accordingly.
    e.g. MCH/DRAM Reference, DRAM Termination, and Channel References, depend on DRAM Voltage, and the default 0.9v corresponds to the default 1.8v DRAM Voltage, better leave them on auto if you don't need to tweak them.
    Same with CPU/MCH References, both depand on CPU Termination.
    If you do want to set them manually, set them to default voltage with the voltage they depend of at default, then change the voltage they depend on to it's desired value.

    Out of curiousity, why set PLL below it's default?

  3. #3
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    Default Re: Help me OC my E8400

    I set the PLL low because I have been reading numerous things across the internet about this voltage as well as the CPU termination voltage and those seemed to be deemed more deadly to the CPU then vcore itself.

    I seemed to have figured out some sort of understanding of these voltages but I know I am just scraping the iceberg coming from an MSI 650i board where half of this stuff didnt exist.

    Im all too familiar with vcore, I need no help there.

    CPU Termination from what I can gather is also referred to as VTT and FSB Termination voltage on some boards. From what I somewhat half@$$ understand this helps with FSB noise reduction at high FSB speeds but high is a relative term. I have also heard that setting this too high can cause instability just like setting it too low. What I would like to know about this voltage is when to use it, what range is acceptable for 24/7 use, and how to know what the right voltage is for different core clock and fsb speeds.

    CPU PLL I understand to be the Phase Locked Loop which I know is the clock signal generator. I can wrap my brain around that. What I don't understand is why this is so harmful to a CPU. I would like to know when to use this voltage, at what ranges its acceptable for 24/7 use, and how to know what the right voltage is for different core clock and fsb speeds.

    CPU Reference is a mystery to me I have heard that it is also called GTL ref on other boards but IDK what that is. All I know is that its best set somewhere around 64% of the VTT

    MCH Core is the NB core voltage, I know what that is and how to use it, no problems there.

    MCH Reference, once again IDK what it is or how to use it. Please teach me. I have been doing all my homework but I need more help.

    MCH/DRAM Ref, teach me, Havent a clue.

    ICH I/O, no problems there. I understand this and when to use it, (which will probably be never for me)

    ICH Core, no problems there. I understand this and when to use it, (which will probably be never for me)

    DRAM Voltage, no problems here.

    DRAM Term, I suppose this does the same thing as VTT for the NB to DRAM. IDK when or how to use it though

    ChanA and ChanB ref, dont have a clue.

  4. #4
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    Default Re: Help me OC my E8400

    It might be a good idea to bump your pll up from 1.35v to default 1.50v. It is not going to do you any harm.

    It might also be a good idea to bump your MCH/DRAM ref, DRAM termination, channel A & B ref to 50% of your DRAM voltage, ie. 1.05v.

    You can leave your cpu and mch ref at 0.76v. You might want to bump up your vtt from 1.20v a step or two. When this is done, your cpu and mch ref will scale up accordingly. You could also reduce your mch and cpu ref 1 or 2 notches down when vtt is at 1.20v, and then bump the vtt up a step or two. The mch and cpu ref will scale up accordingly.

    You didn't mentioned what your drive strength is set at. 1066 will be fine.

    You also didn't mentioned what your static tRead is set at.

    All the best.
    1) Gigabyte EP45-UD3P (rev 1.1, bios F9) E8400 @445x9@1.2625v bios, TRUE 120, Scythe UltraKaze 44cfm, 4x2gb GSkill 8500, Visiontek 3870, Corsair TX850, Antec 900, Win7-64 Home.
    2) Gigabyte EP45-UD3P (rev 1.1, bios F9) E8400 @500x8.5@1.2875v bios, TRUE 120, Schythe UltraKaze 44 cfm, 4x2gb Buffalo FireStyx 8500, XFX 5770, Corsair AX850, CM Scout, WinXP Pro/Win 7-64 Home.
    3) Gigabyte P55A-UD4P (rev 1.0, bios F5) i5 750 @190x20@1.30625v bios, CM Hyper 212+, 4x2gb G.Skill Ripjaw 1600, 7900GS, Corsair TX750, CM Scout, Win7 Pro-64.
    4) Asus P8Z68-V Pro (bios 0801), i5-2500K @44x100@1.248v cpuz, Megahalem rev.B, 4x4gb GSkill Sniper 1600, Corsair AX850, Antec 902, Corsair Performance 3 128GB, Win7-64 Home.


  5. #5
    kick's Avatar
    kick is offline Senior Member
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    Default Re: Help me OC my E8400

    How did you determine the nb was way too hot.The finger test?

    There isnt really enough activity here on watercooled setups,but check out this article,even tho its more benchmarking than 24/7.
    ud3 is also similar to ud3r.
    Gigabyte P45 UD3 review - AwardFabrik - Forum
    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

  6. #6
    Chike is offline Senior Member
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    Default Re: Help me OC my E8400

    About Vtt and GTL Reference in Global and how to set them in http://forums.tweaktown.com/f69/how-...asytune-29746/

  7. #7
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    Default Re: Help me OC my E8400

    Thanks friends, i have spent the past few days reading as much as i can in those links you provided me with. Now, I did this,

    It might be a good idea to bump your pll up from 1.35v to default 1.50v. It is not going to do you any harm.

    It might also be a good idea to bump your MCH/DRAM ref, DRAM termination, channel A & B ref to 50% of your DRAM voltage, ie. 1.05v.
    but i didnt understand this

    You can leave your <nobr style="font-weight: normal; font-size: 100%; color: rgb(0, 0, 255);" id="itxt_nobr_7_0">cpu</nobr> and mch ref at 0.76v. You might want to bump up your vtt from 1.20v a step or two. When this is done, your cpu and mch ref will scale up accordingly. You could also reduce your mch and cpu ref 1 or 2 notches down when vtt is at 1.20v, and then bump the vtt up a step or two. The mch and cpu ref will scale up accordingly.
    Driving strength is at 1066 now since you recommended it and my static tRead is at 11.

    I have my setup at 455fsb. It doesnt crash or anything but prime doesnt last too terribly long. I even left the CPU voltage and chipset voltages raised and lowered the multi down to 6 to underclock the CPU and prime got worse, from 2hrs to 13min. What should I do now? I want to go higher but it seems senseless to try to push higher when my current fsb is unstable.

  8. #8
    Chike is offline Senior Member
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    Default Re: Help me OC my E8400

    Where the settings in post #1 stable?
    Please post the settings in question.

  9. #9
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    Default Re: Help me OC my E8400

    The settings were not stable as I found out. It failed after 13hrs of prime. I assumed it was stable after a prime run of only 10 hrs but after running for 13 it failed. I lowered FSB a little to 455 to see if it would regain stability and it won't. I lowered the multi of the CPU to test only the FSB and it still remains unstable. This time I included FULL system and BIOS specs.


    CPU = E8400 E0 VID: 1.25v
    Motherboard = GA-EP45-UD3R Rev: 1.1
    BIOS Version = F11
    Ram = Corsair Dominator DDR2-1066


    Code:
    MB Intelligent Tweaker(M.I.T.)
    Robust Graphics Booster .................: Auto
    CPU Clock Ratio .........................: 6x
    Fine CPU Clock Ratio.....................: .0
    CPU Frequency ...........................: 2730mhz
    
    
    Clock Chip Control
    Standard Clock Control
    CPU Host Clock Control...................: Enabled
    CPU Host Frequency (Mhz) ................: 455Mhz
    PCI Express Frequency (Mhz) .............: 100Mhz
    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...................: 400Mhz
    System Memory Multiplier ................: 2.00D
    Memory Frequency (Mhz) ..................: 910Mhz
    DRAM Timing Selectable ..................: [Manual]
    
    Standard Timing Control
    CAS Latency Time.........................: 5
    tRCD ....................................: 6
    tRP......................................: 6
    tRAS.....................................: 18
    
    
    Advanced Timing Control
    tRRD.....................................: Auto
    tWTR.....................................: Auto
    tWR......................................: Auto
    tRFC.....................................: Auto
    tRTP.....................................: Auto
    Command Rate (CMD) ......................: 2
    
    Driving Strength Profiles
    Driving Strength ........................: 1066
    
    Channel A
    Static tRead Value.......................: 11
    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.......................: 11
     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
    CPU
    CPU Vcore................................: 1.27500v
    CPU Termination..........................: 1.2v
    CPU PLL..................................: 1.5v
    CPU Reference............................: 0.760v
    
    MCH/ICH
    MCH Core.................................: 1.2v
    MCH Reference............................: 0.760v
    MCH/DRAM Refence.........................: 1.050v
    ICH I/O..................................: 1.5v
    ICH Core.................................: 1.1v
    
    DRAM
    DRAM Voltage.............................: 2.1v
    DRAM Termination.........................: 1.050v
    Channel A Reference......................: 1.050v
    Channel B Reference......................: 1.050v
    
    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................: Enabled

  10. #10
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    Default Re: Help me OC my E8400

    Mch and cpu ref's can be a bit confusing.

    Let's just work with your your lowered multi's at 6x and your fsb at 455.

    When I say drop your mch and cpu ref one notches when vtt=1.20v, and then move the vtt up a notch the following will happen.

    Code:
    MB Intelligent Tweaker(M.I.T.)
    Robust Graphics Booster .................: Auto
    CPU Clock Ratio .........................: 6x
    Fine CPU Clock Ratio.....................: .0
    CPU Frequency ...........................: 2730mhz
    
    
    Clock Chip Control
    Standard Clock Control
    CPU Host Clock Control...................: Enabled
    CPU Host Frequency (Mhz) ................: 455Mhz
    PCI Express Frequency (Mhz) .............: 100Mhz
    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...................: 400Mhz
    System Memory Multiplier ................: 2.00D
    Memory Frequency (Mhz) ..................: 910Mhz
    DRAM Timing Selectable ..................: [Manual]
    
    Standard Timing Control
    CAS Latency Time.........................: 5
    tRCD ....................................: 6
    tRP......................................: 6
    tRAS.....................................: 18
    
    
    Advanced Timing Control
    tRRD.....................................: Auto
    tWTR.....................................: Auto
    tWR......................................: Auto
    tRFC.....................................: Auto
    tRTP.....................................: Auto
    Command Rate (CMD) ......................: 2
    
    Driving Strength Profiles
    Driving Strength ........................: 1066
    
    Channel A
    Static tRead Value.......................: 11
    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.......................: 11
     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
    CPU
    CPU Vcore................................: 1.27500v
    CPU Termination..........................: 1.22v
    CPU PLL..................................: 1.5v
    CPU Reference............................: 0.757v
    
    MCH/ICH
    MCH Core.................................: 1.2v
    MCH Reference............................: 0.752v
    MCH/DRAM Refence.........................: 1.050v
    ICH I/O..................................: 1.5v
    ICH Core.................................: 1.1v
    
    DRAM
    DRAM Voltage.............................: 2.1v
    DRAM Termination.........................: 1.050v
    Channel A Reference......................: 1.050v
    Channel B Reference......................: 1.050v
    
    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................: Enabled
    When vtt is 1.20v, and you lower the cpu ref and mch ref one step from 0.76v, it will be 0.745v and 0.740v, respectively. Then when you increase the vtt up one step from 1.20v to 1.22v, the cpu ref and mch ref will scale up from 0.745v to 0.757v and 0.740v to 0.752v respectively.

    You have to try different combinations of cpu and mch ref. You may have to decrease or increase cpu ref and mch ref 1-3 steps down or up when vtt=1.20v, and then increase the vtt up to find the right gtl ref sweet spot for your hardware. Hope that helps.

    Good luck.
    1) Gigabyte EP45-UD3P (rev 1.1, bios F9) E8400 @445x9@1.2625v bios, TRUE 120, Scythe UltraKaze 44cfm, 4x2gb GSkill 8500, Visiontek 3870, Corsair TX850, Antec 900, Win7-64 Home.
    2) Gigabyte EP45-UD3P (rev 1.1, bios F9) E8400 @500x8.5@1.2875v bios, TRUE 120, Schythe UltraKaze 44 cfm, 4x2gb Buffalo FireStyx 8500, XFX 5770, Corsair AX850, CM Scout, WinXP Pro/Win 7-64 Home.
    3) Gigabyte P55A-UD4P (rev 1.0, bios F5) i5 750 @190x20@1.30625v bios, CM Hyper 212+, 4x2gb G.Skill Ripjaw 1600, 7900GS, Corsair TX750, CM Scout, Win7 Pro-64.
    4) Asus P8Z68-V Pro (bios 0801), i5-2500K @44x100@1.248v cpuz, Megahalem rev.B, 4x4gb GSkill Sniper 1600, Corsair AX850, Antec 902, Corsair Performance 3 128GB, Win7-64 Home.


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