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Thread: Stable E8400 OC - stock voltages




  1. #251

    Default Re: Stable E8400 OC - stock voltages

    Quote Originally Posted by Psycho101 View Post
    The 40+ GFlops screen-shots etc are from a Quad core @ 3.4GHz. For a dual core, your figures are about right.

    I'd run Prime 95 over night now on blend. I do have a feeling that you may need 1.26-1.30V CPU termination and also need to adjust MCH Ref to = 0.740 or 0.720 when CPU Term is 1.2V.

    You should also be able to get away with using 2.4B or 2.5A to bring your RAM up a little. I recommend getting stable at 4GHz with 2.4B. This will give you room to increase FSB up to a max of ~480. You should get up to ~465*9 with a RAM speed of 1116, but concentrate on getting 445*9 stable first. Having 445*9 100% stable makes it a bit easier to increase FSB and tweak to regain stability as you should now have an idea of what's needed for stability.

    Prime exactly what you have in the first template in post # 242 except change to 2.4B. If you get a fail before 8 hours, follow the MCH Ref and VTT suggestions above, testing each time to see if the system is stable longer. I'd look to settle at somewhere between your current 4GHz and 4.2GHz.
    Okay. Prime95 threw 1 error and 0 warnings on Worker #2 (Core 1? of 0 and 1?). This was only after 30 minutes of Blend and Worker #2 was stopped. Worker #1 continued but I stopped the test as I found it at 1 hour and 39 minutes.

    So clearly adjustments are necessary but I'm not clear on your suggestions.

    I did bump the SMM to 2.4B. I see you mention adjusting CPU Term and MCH Ref. However, I'm not sure where to adjust it to.

    Current:

    CPU Termination: 1.24V
    (you note a possible 1.26 - 1.3)
    MCH Reference: .785V (you note a possible .74 -.72 -> when CPU Term is 1.2V)

    Sorry but I'm a bit confused by this as some adjustments are to go up and some down? Plus the MCH Ref note is confusing since you noted .74 - .72 when CPU Term is 1.2v and I'm already at 1.24v. So I'm not sure where to start setting numbers and clear on what to do.
    Last edited by SBMongoos; 10-27-2009 at 11:24 PM.
    Gigabyte EP45-UD3R (rev 1.1, bios F12), E8400 @ 3.83Ghz, Xigmatek S1283, 2x2Gb OCZ2RPR11504GK Reaper PC2-9500 HPC 1150Mhz, PNY 9600 GSO 768MB PCI-e OC , CoolerMaster 590, WinXP SP3 32bit and Win7 Pro 64 Bit (swappable HDD's via Icy Dock)


  2. #252

    Default Re: Stable E8400 OC - stock voltages

    Quote Originally Posted by SBMongoos View Post
    For whatever it's worth I tried the 4.005Ghz settings and then updated the BIOS to F11. The PC didn't like it. So instead of messing around with tweaking I switched back to F7.

    Odd though as I'm now getting this error when I go into Windows:

    This occurred because I overlooked disabling the Floppy Drive in the BIOS when I did the update from F7 to F11 (then back to F7). Windows tried to find the Floppy Drive and it even showed up in Explorer even though there wasn't one installed. I've since disabled this and cleared the error.
    Gigabyte EP45-UD3R (rev 1.1, bios F12), E8400 @ 3.83Ghz, Xigmatek S1283, 2x2Gb OCZ2RPR11504GK Reaper PC2-9500 HPC 1150Mhz, PNY 9600 GSO 768MB PCI-e OC , CoolerMaster 590, WinXP SP3 32bit and Win7 Pro 64 Bit (swappable HDD's via Icy Dock)


  3. #253

    Default Re: Stable E8400 OC - stock voltages

    Psycho101, LSDMEASAP or BoombasticSloth available for feedback on post #251? I hope I didn't some how piss anyone off. Just need to get the final stages tweaked. Need clarification. Thank you!

    Okay. Prime95 threw 1 error and 0 warnings on Worker #2 (Core 1? of 0 and 1?). This was only after 30 minutes of Blend and Worker #2 was stopped. Worker #1 continued but I stopped the test as I found it at 1 hour and 39 minutes.

    So clearly adjustments are necessary but I'm not clear on your suggestions.

    I did bump the SMM to 2.4B. I see you mention adjusting CPU Term and MCH Ref. However, I'm not sure where to adjust it to.

    Current:

    CPU Termination: 1.24V (you note a possible 1.26 - 1.3)
    MCH Reference: .785V (you note a possible .74 -.72 -> when CPU Term is 1.2V)

    Sorry but I'm a bit confused by this as some adjustments are to go up and some down? Plus the MCH Ref note is confusing since you noted .74 - .72 when CPU Term is 1.2v and I'm already at 1.24v. So I'm not sure where to start setting numbers and clear on what to do.
    Gigabyte EP45-UD3R (rev 1.1, bios F12), E8400 @ 3.83Ghz, Xigmatek S1283, 2x2Gb OCZ2RPR11504GK Reaper PC2-9500 HPC 1150Mhz, PNY 9600 GSO 768MB PCI-e OC , CoolerMaster 590, WinXP SP3 32bit and Win7 Pro 64 Bit (swappable HDD's via Icy Dock)


  4. #254
    Chike is offline Senior Member
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    Default Re: Stable E8400 OC - stock voltages

    The MCH and CPU reference are relative to vtt(CPU Term) and change when you change it. They are actually precentage of vtt.
    Since the default(0.760) is known for the default vtt(1.2v) the changes of reference refer to the default vtt.
    Meaning you need to set vtt 1.2v make the change in vtt and than move it back to your current value. You will notice the reference changes relative to the new vtt.
    0.76@1.2 ~ 0.785@1.24
    0.74@1.2 ~ 0.762@1.24
    0.72@1.2 ~ 0.744@1.24

  5. #255

    Default Re: Stable E8400 OC - stock voltages

    Quote Originally Posted by Chike View Post
    The MCH and CPU reference are relative to vtt(CPU Term) and change when you change it. They are actually precentage of vtt.
    Since the default(0.760) is known for the default vtt(1.2v) the changes of reference refer to the default vtt.
    Meaning you need to set vtt 1.2v make the change in vtt and than move it back to your current value. You will notice the reference changes relative to the new vtt.
    0.76@1.2 ~ 0.785@1.24
    0.74@1.2 ~ 0.762@1.24
    0.72@1.2 ~ 0.744@1.24
    Thanks for you response but I'm confused by this. I see it as three different things:


    1. VTT (what is this exactly)
    2. CPU Term
    3. MCH Ref


    But yet 1 = 2 & 3? Maybe I'm in too much of a hurry this a.m. but can you put the info in more layman's terms?

    Thanks!
    Gigabyte EP45-UD3R (rev 1.1, bios F12), E8400 @ 3.83Ghz, Xigmatek S1283, 2x2Gb OCZ2RPR11504GK Reaper PC2-9500 HPC 1150Mhz, PNY 9600 GSO 768MB PCI-e OC , CoolerMaster 590, WinXP SP3 32bit and Win7 Pro 64 Bit (swappable HDD's via Icy Dock)


  6. #256
    Chike is offline Senior Member
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    Default Re: Stable E8400 OC - stock voltages

    vtt = CPU termination.
    Both reference voltages are relative to vtt and drived from it.

    Your current MCH Ref is 0.785@1.24vtt so that is like 0.760@1.2vtt, change vtt to 1.2 and see what is the MCH Ref is changed to.

    As I said the reference voltages are percent of vtt. Sadly it's not how it is represented in BIOS like it is in the X38/X48 boards, which would cause much less of confusion and simplify the way to set them.

  7. #257

    Default Re: Stable E8400 OC - stock voltages

    Quote Originally Posted by Chike View Post
    vtt = CPU termination.
    Both reference voltages are relative to vtt and drived from it.

    Your current MCH Ref is 0.785@1.24vtt so that is like 0.760@1.2vtt, change vtt to 1.2 and see what is the MCH Ref is changed to.

    As I said the reference voltages are percent of vtt. Sadly it's not how it is represented in BIOS like it is in the X38/X48 boards, which would cause much less of confusion and simplify the way to set them.
    I find that confusing. LOL. So I'm at .785 MCH Ref with 1.24v CPU Term. CPU Term is VTT (whatever VTT stands for) correct? But I'm actually not? It actually equals .76 Mch Ref and 1.2 CPU Term instead? How do we arrive at that? (maybe I haven't had enough coffee yet) Is that like saying 4/8 equals 1/2? And since we think it's really 1.2 CPU Term I should drop it to that value and see what happens to MCH Ref? This makes no sense. For me those are manual settings. They don't just randomly change. As in change one and another setting gets changed. Unless people are finding out the BIOS settings are simply wrong and equal something else.

    Where else can I go to see these readings if not in the BIOS? Any software I have doesn't really show this. Some but not what we're talking about.

    By the way the "Normal" settings for my mb with f/w F7 for CPU Term is 1.2v and the MCH Ref is .76v.
    Last edited by SBMongoos; 10-31-2009 at 11:54 PM.
    Gigabyte EP45-UD3R (rev 1.1, bios F12), E8400 @ 3.83Ghz, Xigmatek S1283, 2x2Gb OCZ2RPR11504GK Reaper PC2-9500 HPC 1150Mhz, PNY 9600 GSO 768MB PCI-e OC , CoolerMaster 590, WinXP SP3 32bit and Win7 Pro 64 Bit (swappable HDD's via Icy Dock)


  8. #258
    Chike is offline Senior Member
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    Default Re: Stable E8400 OC - stock voltages

    Quote Originally Posted by SBMongoos View Post
    Is that like saying 4/8 equals 1/2?
    Exactly that. Default CPU Ref is .063333...(63%) of CPU Term, and as long you don't change it it remain 0.63333. If it was like that in BIOS you would be told simply to set it to .62 or 0.63 or whatever, since it's not, and you can't expect people to remember all reference values for all vtt values, vtt 1.2 is used as point of reference.
    If you understand this you don't have to drop to vtt 1.2 change them and set it back to current value.

  9. #259

    Default Re: Stable E8400 OC - stock voltages

    Sorry guys. I'm a visual learner and having a tough time with this. I'm sort of getting it but it's not clear. I'm not sure what to adjust to what and how to verify what I'm actually getting and then what to set it to. Right now it's about as clear as mud. I hate to say it but I need to find someone available to walk me through this process.
    Gigabyte EP45-UD3R (rev 1.1, bios F12), E8400 @ 3.83Ghz, Xigmatek S1283, 2x2Gb OCZ2RPR11504GK Reaper PC2-9500 HPC 1150Mhz, PNY 9600 GSO 768MB PCI-e OC , CoolerMaster 590, WinXP SP3 32bit and Win7 Pro 64 Bit (swappable HDD's via Icy Dock)


  10. #260

    Default Re: Stable E8400 OC - stock voltages

    Anyone? I think we're really close.
    Gigabyte EP45-UD3R (rev 1.1, bios F12), E8400 @ 3.83Ghz, Xigmatek S1283, 2x2Gb OCZ2RPR11504GK Reaper PC2-9500 HPC 1150Mhz, PNY 9600 GSO 768MB PCI-e OC , CoolerMaster 590, WinXP SP3 32bit and Win7 Pro 64 Bit (swappable HDD's via Icy Dock)


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