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Thread: E8400 and UD3R help to 4ghz




  1. #21
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    Default Re: E8400 and UD3R help to 4ghz

    Callistra, just for the fun of it, I did a quick linear regression using only 3 samples (, and of course there are other variables at play,) but it might give you an idea of what you should try your vcore at to get 445x9. The first 2 samples are from my two E8400 and the 3rd sample is from Dan's. The more sample data there are, the more accurate the linear regression line would be in predicting vcore needed to be stable at 445x9

    VID: 1.175V , 1.20V, and 1.275v
    Vcore needed to get 445 x 9: 1.2375v, 1.2625v, 1.30625v.




    This is a small sample but notice that in the following scattergram, the distribution is fairly linear. The Linear regression formula was calculated and if you plug in your vid number of 1.25v into the linear regression formula, the expected Vcore needed for 445x9 for VID of 1.25v is 1.290875v +-:

    Y=(0.6635 x 1.25v) + 0.4615v = 1.290875v

    I realize that you are priming now at 1.31+-v, but if you have your other bios settings done properly, you might be able to lower your vcore down to around 1.29v +- and be stable. YMMV.
    Last edited by BoombasticSloth; 06-25-2009 at 04:11 AM. Reason: Updated graph
    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.


  2. #22
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    Default Re: E8400 and UD3R help to 4ghz

    Psycho, thanks for your sugestions but those did not work either. Same thing, during first prime iteration pc restarts.
    GA-EP45-UD3R (F12)
    Zalman CNPS-7000C-CU
    E8400@3.6GHz
    2x2GB A-DATA Vitesta 800+ CL4 Extreme Edition @ 1066MHz@2.0V (5-5-5-15)
    Asus EN9800GT Ultimate @ 810/2000/2200
    Seagate 250GB + WD 500GB + WD 640GB
    Asus DRW 1608-P
    BenQ G2010WP
    Thermaltake TR2 500W
    Windows 7 Pro x64

  3. #23
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    Default Re: E8400 and UD3R help to 4ghz

    Can those with an E8400 who has successfully run 4ghz, 24hr prime95 blend stable post their VID, and their vcore needed? Just for curiosity's sake, I want to see how accurate this regression line is for this chip. I will also update the regression line with the new data provided. You can find your VID with CoreTemp, or read the default vcore value in your bios. Thanks.

    This may also help the OP as well, so I hope I am not hijacking the OP's thread. So Callistra, how are things working out?
    Last edited by BoombasticSloth; 06-25-2009 at 04:18 AM. Reason: Changed from 445x9 to 4ghz to reach a larger audience.
    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.


  4. #24
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    Default Re: E8400 and UD3R help to 4ghz

    Regarding my problem reaching 4GHz, i've seem to kind of sort it out. Using up to 1.35 vcore with LLC enabled resulted in a almost imediate p95/orthos/linx crash.
    So for the fun of it, i've tryed disabling LLC and using 1.375 vcore (which is 1.312 to 1.328 as shown by CPU-Z under load). Pretty stable for now with lower temps, and I haven't even adjusted anything else except vtt which is 1.26 and mch which is 1.3, everything else is set to normal. But I strongly feel those could be lowered.
    Anyone else has seen this before?
    GA-EP45-UD3R (F12)
    Zalman CNPS-7000C-CU
    E8400@3.6GHz
    2x2GB A-DATA Vitesta 800+ CL4 Extreme Edition @ 1066MHz@2.0V (5-5-5-15)
    Asus EN9800GT Ultimate @ 810/2000/2200
    Seagate 250GB + WD 500GB + WD 640GB
    Asus DRW 1608-P
    BenQ G2010WP
    Thermaltake TR2 500W
    Windows 7 Pro x64

  5. #25
    Join Date
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    Default Re: E8400 and UD3R help to 4ghz

    It ended up being stable. And temps dropped a lot after the second day.. dunno why.. back down to 39C under general usage.

    This was stable for me.. VID is 1.25v and it's stable on 3.6ghz @ 1.25v.

    Code:
    Robust Graphics Booster ...............: [Auto]
    CPU Clock Ratio .......................: [ 9]
    Fine CPU Clock Ratio...................: +0.0
    CPU Frequency .........................: 4.00GHz
    
    Clock Chip Control
    Standard Clock Control
    CPU Host Clock Control.................: [Enabled]
    CPU Host Frequency (Mhz) ..............: 445Mhz
    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 ..............: 2.00D
    Memory Frequency (Mhz) ................: 890
    DRAM Timing Selectable ................: [Manual]
    
    Standard Timing Control
    CAS Latency Time.......................: 4
    tRCD ..................................: 4
    tRP'...................................: 4
    tRAS...................................: 12
    
    Advanced Timing Control
    tRRD...................................: 4
    tWTR...................................: 4
    tWR....................................: 6
    tRFC...................................: 54
    tRTP...................................: 4
    Command Rate (CMD) ....................: 2
    
    Driving Strength Profiles
    Driving Strength ......................: [1066]
    
    Channel A
    Static tRead Value.....................: 9
    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]
    DDR Write Training.....................: [Auto]
    
    Channel B
    Static tRead Value.....................: 9
    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]
    DDR Write Training.....................: [Auto]
    
    Motherboard Voltage Control
    Voltage Type...........................: [Manual]
    
    CPU---------------------Normal-----------Current
    
    Load Line Calibration..................: [Disabled]
    CPU Vcore...............1.25000V.......: 1.31875V
    CPU Termination.........1.200V.........: 1.260V
    CPU PLL.................1.500V.........: 1.570V
    CPU Reference...........0.760V.........: [Auto]
    
    MCH/ICH
    MCH Core................1.100V.........: 1.24v
    MCH Reference...........0.760V.........: [Auto]
    MCH/DRAM Reference......0.900V.........: [Auto]
    ICH I/O.................1.500V.........: 1.570V
    ICH Core................1.100V.........: 1.100V
    
    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..............: [Enabled]
    
    Integrated Peripherals
    Legacy USB Storage Detect .............: [Disabled]
    Last edited by Callistra; 06-25-2009 at 06:23 AM.

  6. #26
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    Default Re: E8400 and UD3R help to 4ghz

    The temperature drop could possibly be a simple drop in ambient temperature. Ambient temps are a huge factor in air cooling effectiveness.
    Coolermaster CM 690 II advance Case
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  7. #27
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    Default Re: E8400 and UD3R help to 4ghz

    Quote Originally Posted by Callistra View Post

    Load Line Calibration..................: [Disabled]
    CPU Vcore...............1.25000V.......: 1.31875V
    CPU Termination.........1.200V.........: 1.260V
    CPU PLL.................1.500V.........: 1.570V
    CPU Reference...........0.760V.........: [Auto]

    MCH/ICH
    MCH Core................1.100V.........: 1.24v
    MCH Reference...........0.760V.........: [Auto]
    MCH/DRAM Reference......0.900V.........: [Auto]
    ICH I/O.................1.500V.........: 1.570V
    ICH Core................1.100V.........: 1.100V
    It is great that your setup is stable. I noticed you still have your Cpu Reference and MCH Reference on Auto. If you have the inclination, you might try Psycho's suggestion in post #9 by manually lowering those settings to possibly gain stability with possibly lower cpu vcore.
    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.


  8. #28
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    Default Re: E8400 and UD3R help to 4ghz

    It's happened every time I've messed with clock speed or vcore in bios.. first few hours temps are up from norm.. if I leave it on enough temps stabilize. Even if I'm going DOWN in clock and vcore.. it'd odd but happy about the eventual stabilizing.

    It'd be nice if I could get a lower vcore.. I'll try that :)

  9. #29
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    Default Re: E8400 and UD3R help to 4ghz

    Statistically speaking, if the errors are normally distributed, there is a 99% probability that you can get your 4ghz at under 1.30926v; 95% probability that you can get it under 1.303013v, and 68% probability that you can achieve it at under 1.297v. Just a guide of course, and assuming there is nothing wrong with your setup and your bios is tweaked properly. YMMV :0).
    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.


  10. #30
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    Default Re: E8400 and UD3R help to 4ghz

    Hey, I was just wondering.. did you guys ever had the following problem: if setting MCH and CPU references to Auto system if unable to POST, no matter what VTT (tryed from 1.1V to 1.32V) but when setting manual, every value from the .7-.8 range can POST but is instable in windows.
    I'm asking because I've seen almost everywhere over the forum advices as to use those both with auto, as it's set correctly that way.
    GA-EP45-UD3R (F12)
    Zalman CNPS-7000C-CU
    E8400@3.6GHz
    2x2GB A-DATA Vitesta 800+ CL4 Extreme Edition @ 1066MHz@2.0V (5-5-5-15)
    Asus EN9800GT Ultimate @ 810/2000/2200
    Seagate 250GB + WD 500GB + WD 640GB
    Asus DRW 1608-P
    BenQ G2010WP
    Thermaltake TR2 500W
    Windows 7 Pro x64

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