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Thread: Some advice on my E8400 overclock please




  1. #1

    Smile Some advice on my E8400 overclock please

    Hi All,

    I recently put together my system (spec at the end), and have played around with overclocking my E8400 to try and achieve around 4Ghz based on reading a lot in this forum, however, I would like some opinions on whether my settings/voltages make sense (especially as I am running 8Gb here), plus also what would be good to try and improve them (such as lowering them, or maybe changing FSB and so on). I am aiming for 4GHz really (don't really want to go much higher due to heat, reduced life etc.) Please bear in mind I am relatively new at this (please be gentle!)

    Here's my BIOS settings that I have tested with Memtest first and subsequently with Prime95 (2.59.11) blend for 6 hours without errors:

    Code:
     
    MB Intelligent Tweaker(M.I.T.)
    Robust Graphics Booster ..................: Auto
    CPU Clock Ratio ..........................: 8.0x
    Fine CPU Clock Ratio......................: 0.5x
    CPU Frequency ............................: 3.99GHz
     
    Clock Chip Control 
    Standard Clock Control
    CPU Host Clock Control....................: [Enabled] 
    CPU Host Frequency (Mhz) .................: 470Mhz
    PCI Express Frequency (Mhz) ..............: 101
    C.I.A.2 ..................................: [Disabled]
     
    Advanced Clock Control [Press Enter]
    CPU Clock Drive...........................: 800
    PCI Express Clock Drive...................: 900
    CPU Clock Skew (ps).......................: 0
    MCH Clock Skew (ps).......................: 0
     
    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) ...................: 940
    DRAM Timing Selectable ...................: [Manual]
     
    Standard Timing Control
    CAS Latency Time..........................: 5
    tRCD .....................................: 5
    tRP'......................................: 5
    tRAS......................................: 15
     
    Advanced Timing Control
    tRRD......................................: 4
    tWTR......................................: 4
    tWR.......................................: 6
    tRFC......................................: 71
    tRTP......................................: 4
    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  ps
    Dimm2 Clock Skew Control..................: Auto  ps
     
    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  ps
    Dimm2 Clock Skew Control..................: Auto  ps
     
    Motherboard Voltage Control
    CPU LLC...................................: [Disabled]
    CPU Vcore.................................: 1.36875
    CPU Termination…..... 1.200V*.............: 1.30
    CPU PL................1.500V*.............: 1.570
    CPU Referen...........0.755V*.............: 0.848  (0.785 @ VTT=1.2)
    MCH/ICH
    MCH Core..............1.100V..............: 1.30
    MCH Reference.........0.760V..............: 0.70   (0.763 @ VTT=1.2)
    MCH/DRAM Ref..........0.900V..............: 0.90
    ICH I/O...............1.500V..............: 1.50
    ICH Core..............1.100V..............: 1.10
     
    DRAM
    DRAM Voltage..........1.800V..............: 2.200
    DRAM Termination......0.900V..............: 0.900
    Channel A Reference...0.900V..............: 0.900
    Channel B Reference...0.900V..............: 0.900
     
    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 ................: [Enabled]
    Here's my setup at the moment:
    E8400 @ 3.99Ghz
    8Gb OCZ Reaper HPC PC8500 (4 x 2Gb)
    EP45-UD3P rev 1.0 (BIOS F9)
    Sapphire 4890 1gb (at stock)

    Temps are 32 degrees C idle, 50 degrees C loaded.

    Thank you very much for your thoughts.
    Last edited by i_saw_drones; 10-18-2009 at 11:57 PM.

  2. #2
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    Default Re: Some advice on my E8400 overclock please

    Your settings looks pretty good and your temps look good. If your trying to lower voltages, you can try increasing the clock ratio from your current 8.5 to 9.0, and then drop your CPU host frequency from 470 down to 445. By doing this you may be able drop your vdimm from 2.2v and most likely reduce your vcore from 1.3685v, depending on what your VID is. You might even be able to reduce your cpu termination from 1.30v down a few steps. Also you may try reducing your cpu ref by a step or two from its current 0.848v. You can also try reducing your MCH core from it's current 1.30v. I have been successful down to 1.20-1.22v with 8gb of ram. You might even be able to drop your static tread value from 11 down to 10, depending on your ram. Start with reducing your vcore first and memory last. Just my opinion. Good luck.

    What is your cpu's VID? Is it an E0 stepping?
    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.


  3. #3

    Default Re: Some advice on my E8400 overclock please

    Hey thanks a lot for your useful, detailed comments - especially regarding your results for the MCH core since any temp reduction is good :)

    Oh yes, my VID, as far as I remember it is 1.2375v and yes, you are right, my chip is an "E0" - could I get away with a lower vcore in this case?

  4. #4
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    Default Re: Some advice on my E8400 overclock please

    You might find this helpful. As your VID is 1.2375v, you might be able to get your vcore down to around 1.31 v +- . Please let me know what you end up with, because your 1.2375v VID cpu would be a great addition to include in the sample data set and would help to improve the accuracy of the regression formula.


    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
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    Default Re: Some advice on my E8400 overclock please

    I have a quick question on your reference voltge settings. I understand how you've written CPU Ref and thank you for not only including the current value, but also the all important value when CPU Term (VTT) is 1.2V. However, applying the same logic to your MCH Ref, I'm confused. You say the actual reading at 1.3VTT is 0.70V but it's set to 0.76V @ 1.2VTT.

    Is it the other way around? Is it 0.70V @1.2VTT and 0.76V after raising VTT to 1.3V? If so, this is about right for your level of over clock. If not, I'd consider trying the range of 0.680V-0.780V @ 1.2VTT, then raising VTT back to the required level. I include 0.760 and 0.780V in that range only as cover. Likely, as you may know, dual cores like less than stock MCH Ref at 3.6-3.8GHz+. A correct adjustment of this may also help reduce Vcore.

    One useful thing about Intel Burn Test is that at insufficient Vcore, the amount of computational speed (GFlops) and also the peak core temps are noticeably less than if the Vcore is set correctly. You can use this to your advantage. Temporarily set a Vcore a couple of notches higher than you have now, just for certainty and do 2-3 runs. Note down the peak temps and more importantly, the GFlops figure given. Now procede to lower Vcore until you notice a drop in GFlops value and a much cooler temp than normal. Restore the Vcore that gave you "normal" GFlops values and procede to test it in Prime/Orthos/OCCT over night. If it passes 8-12 hours, run IBT again for 10-20 runs, and if all passes I'd call it good for general purpose and 3D gaming. If you get a fail in Prime/Orthos/OCCT then raise Vcore by a single notch and try again. There will always be a single notch between just enough and too little. The IBT method should narrow down stability to within 2 Vcore increments (increase). It also saves a lot of time just experementing by lowering one notch then testing for 8 hours, then repeating.
    Coolermaster CM 690 II advance Case
    Corsair HX750 (CWT, 91%(80+ Gold rated @230V) single 62A 12V rail
    P55A-UD4 v2.0 @ F14
    Core i5 760 @ 20 x 201, 4.02GHz
    TRUE Black with a single Noctua NF-P12 pumping out 55 CFM @ 19db .
    2 x 2GB Mushkin Ridgeback (996902), @ 7-10-8-27, 2010-DDR, 1.66v
    2 x Gigabyte GTX 460 1024MB in SLI (Pre OC'd to 715MHz core and 1800MHz VRAM) @ 850 Core / 4100 Mem.
    Intel X25-M Boot Drive (OS and Programs) 200MB/s Read & 90MB/s Write
    Corsair X32 200MB/s Read & 100MB/s Write
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  6. #6
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    Default Re: Some advice on my E8400 overclock please

    Good catch about the mch ref. I didn't even notice that.

    Very interesting tip with the IBT and Gflop and Temps. Very clever.
    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.


  7. #7

    Default Re: Some advice on my E8400 overclock please

    Hi both,

    Sorry for the delay, been so busy at work

    First of all thank you very much for your replies and information, very useful stuff.

    BoombasticSloth: Thanks for the indication about the MCH core and also the chart - I have some good(ish) news, I reduced the FSB down to 445MHz and set the multiplier up to 9.0x. Just tested for 24 hours straight at 1.3125v Vcore using Prime64 Blend and no errors so far, so that seems to fit in with your chart. However, I will do some more testing on the other Prime modes to be sure.

    Psycho101: you are right, I got a bit mixed up with the reference voltages. They actually are set as follows:

    Code:
    CPU Vcore.................................: 1.3125
    CPU Termination…..... 1.200V*.............: 1.30
    CPU PL................1.500V*.............: 1.570
    CPU Referen...........0.755V*.............: 0.808 (0.745 @ VTT=1.2)
    MCH/ICH
    MCH Core..............1.100V..............: 1.28
    MCH Reference.........0.760V..............: 0.763 (0.70 @ VTT=1.2)
    I also tried what you suggested with IBT (on 64bit) and ran for 15 passes without any problems or big variations in GFlops (~27GFlops - average difference was <0.2Gflops). So all seems alright for the moment...
    Last edited by i_saw_drones; 10-27-2009 at 08:18 AM.

  8. #8
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    Default Re: Some advice on my E8400 overclock please

    Hey, looks good.
    With Psycho's suggestion about finding the lowest Vcore for the 4ghz with IBT, what was the lowest vcore before you saw drop in Gflops and temps?

    1.3125v vcore is not set in stone, as it is just "expected" vcore for your vid cpu, so it can be lower. Also, you might have room to drop your vtt from 1.30v. If you get an error when you drop your vcore from 1.3125v, and vtt, try increasing your mch ref by one notch. Would be interested to see if that would help. Just going with a gut feeling on this.

    Your on the right track, my friend. Would like to see what the lowest vcore you can get with stability at 4ghz.

    Good stuff.

    edit: Oh what are your temps at idle and load now? Ambient as well.
    Last edited by BoombasticSloth; 10-27-2009 at 09:43 AM.
    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.


  9. #9
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    Default Re: Some advice on my E8400 overclock please

    I got a question too. How can your CPU have VID of 1.23, when my E0 has 1.25?

    Also, it seems like I need 1.35 VCORE for 4GHz no matter how I experiment with ref voltages - this is to ensure Blend test in Prime95 doesn't fail though - interestingly Small FFTs pass with less (at least it did the last time I tried). So is it really so that higher FSB requires higher VCORE? Because if so, I might consider losing some performance and run cooler with lower voltages. I don't think 1.35+ VCORE is too good for this CPU.
    Last edited by Octopuss; 10-30-2009 at 04:56 PM.

  10. #10
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    Default Re: Some advice on my E8400 overclock please

    Core stepping doesn't matter when it comes to what VID a chip has. Chikes E7xxx has a super low VID, and some E7xxx have a vid of less than 1.1V, lowest I've seen is 1.0V. Stepping may determine what top clock speed you get and the voltage needed to do it, but has little to do with the voltage needed for the chip to run at stock clocks. Vid range is the same for all 45nm chips, regardless of stepping.

    1.35V shouldn't be an issue. If your temps are good, why worry? I'm running 1.45V and nothig's blown up yet. :thumbsup. 6 months and still going strong, with lots of taxing gaming, encoding etc. Core 2 is on the way out now in performance terms. I say flog the horse for every last MHz you can and on the 1 in 100,000 chance you get a hardware failure, upgrade to i7.
    Coolermaster CM 690 II advance Case
    Corsair HX750 (CWT, 91%(80+ Gold rated @230V) single 62A 12V rail
    P55A-UD4 v2.0 @ F14
    Core i5 760 @ 20 x 201, 4.02GHz
    TRUE Black with a single Noctua NF-P12 pumping out 55 CFM @ 19db .
    2 x 2GB Mushkin Ridgeback (996902), @ 7-10-8-27, 2010-DDR, 1.66v
    2 x Gigabyte GTX 460 1024MB in SLI (Pre OC'd to 715MHz core and 1800MHz VRAM) @ 850 Core / 4100 Mem.
    Intel X25-M Boot Drive (OS and Programs) 200MB/s Read & 90MB/s Write
    Corsair X32 200MB/s Read & 100MB/s Write
    WD Caviar Blue 640GB C (Steam, Games, Storage, Temp Files & Folders, etc)
    Samsung F3 500GB Backup/Images
    Noctua 1300RPM 19dB case fan (rear extraction)
    3 x 140 MM Coolermaster LED fans (one front intake, one top extraction, one side intake)
    Dell Ultra Sharp 2209WAf E-IPS @ 1680x1050

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