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Thread: i5-2500k OC on P67A-UD4-B3 F4 BIO




  1. #1
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    Default i5-2500k OC on P67A-UD4-B3 F4 BIO

    Hi,

    I have successfully overclocked my i5-2500k to 4.3 GH over the weekend and ran Linx stress test without any problem following the Bit-Tech guide (How to Overclock the Gigabyte GA-P67A-UD4 | bit-tech.net). I originally tried the 4.5 GH but had BSOD while running Linx, and the only difference between my setting and the Bit-Tech setting was the DDR3 voltage. It says to set it at 1.65v, but I keep it at 1.5v according to the XMP profile. This is the RAM I have (Newegg.com - G.SKILL Ripjaws X Series 8GB (2 x 4GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800) Desktop Memory Model F3-12800CL8D-8GBXM). I then lower the OC to 4.4 GH and ran Linx, which produced an error. I then raise the vcore to 1.325 and everything runs fine other than that the temperature hit 80c a couple times while running Linx. So to be safe, I lowered the OC to 4.3 GH and lower the vcore to 1.3 and the CPU runs perfect.

    So my question is, since I am a first timer, does the DDR voltage matter when OCing even though I am running at 1600 stock speed? I originally thought that I only need to adjust the voltage if I am running at 1833 or something like that. Am I wrong? and should I adjust the voltage to 1.65v and try the 4.5 GH OC again? Or should I keep it at 1.65v regardless?

    Another question is, I have heard ppl saying VCCSA should be left untouched and only change the VTT voltage. The guide had VCCSA set at 1.135, which is much much higher than the original 0.920. Does it have any long term negative effect?

    In addition, I have heard not to break 80c in temp. Tho I assume that if I rise vcore voltage to 1.35 I can run 4.5 GH without a problem. Other than running Linx, my computer never really reach 50c even when playing game. So should I up it and go with 4.5 instead of 4.3?

    Spec are windows 7 x 64
    i5-2500k
    Coolmaster V8
    HD 6950 @stock speed
    Corsair 750w
    GSkull DDR3 12800 8GB (2x 4GB) 1600 8-8-8-24 2T 1.5v

    Thank you.

  2. #2
    Chike is offline Senior Member
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    Default Re: i5-2500k OC on P67A-UD4-B3 F4 BIO

    They are lees than month out not enough to know about long term effects.
    VCCSA max by Intel is 0.971v, go with your heart.
    Your ram is rated 1.5v, maybe you can add a little more, not as much as 1.65v.
    What VTT you are using?

    There is no need to run LinX for long period of times, 5-10 loops are sufficient. Run Prime95 blend for 10+ hours, it's less stressfull and likely to find instabilities LinX won't.

  3. #3
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    Default Re: i5-2500k OC on P67A-UD4-B3 F4 BIO

    VTT is 1.120 as suggested by the site. i am going to lower the VCCSA to auto and see if I run into any problem.

    I will do Prime95 to test stability next time. Do you have a good setting? The interface of Prime95 isn't very intuitive, so let me know which type of test to run (there are like 3 different one I believe).

    Thank you.

  4. #4
    Chike is offline Senior Member
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    Default Re: i5-2500k OC on P67A-UD4-B3 F4 BIO

    I usually run an hour or two small FFT, then hour or two large FFT then 8+ hoers blend.
    I customize the blend to run only 8 minutes each test (it will usually fail before if it does) and a bit less memory than available (~3GB of memory for my setup).
    If you know FFT that failed you can try and repeat it by setting min and max FFT to that value for quickly reproducing the error without having to wait hours again.

  5. #5
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    Default Re: i5-2500k OC on P67A-UD4-B3 F4 BIO

    I set VCCSA to auto and everything runs fine. Did prime95 last night with Small FFT 2hours, Large FFT 2 hours, and Blend overnight for 10 hours. No error or warning. So i guess so far so good. I will see if I can up the clock to 4.5 with higher vcore without the temp going over 80.

  6. #6
    Chike is offline Senior Member
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    Default Re: i5-2500k OC on P67A-UD4-B3 F4 BIO

    Check EasyTune -> Tuner -> Advanced -> Voltage tab for actual applied(target) voltages to make sure none of them is overvolted.

  7. #7
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    Default Re: i5-2500k OC on P67A-UD4-B3 F4 BIO

    From what I understand, in order to install ET6, I need to uninstall CPU-Z, at least that's what I come up with when trying to install ET6 and it won't let me. I will uninstall CPU-Z tonight and try ET6.

  8. #8
    Chike is offline Senior Member
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    Default Re: i5-2500k OC on P67A-UD4-B3 F4 BIO

    Never heard that one before.
    Try to download the latest version from the motherboard web page.

  9. #9
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    Default Re: i5-2500k OC on P67A-UD4-B3 F4 BIO

    No need to uninstall CPU-Z. I've used ET6 countless times and have always had a copy of CPU-Z on my system.

    CPU-Z's install routine doesn't even write anything to the registry, so as long as it isn't running, ET6 would be completely unaware of its presence.

    If you have issues with ET6, be sure to have the latest .NET framework and C++ libraries, as well as the latest version of ET6.
    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

  10. #10
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    Default Re: i5-2500k OC on P67A-UD4-B3 F4 BIO

    How do I make sure I have the latest .NET framework and C++ or if I am missing any version updates? I check windows update daily, so if anything, I should have the most current. I have tried uninstalled CPU-Z and it didn't work either.

    When I try to install ET6 I get over driver handle failure and something about fsstr I forgot. I got the ET6 from both the stickie and the gigabyte website so I have the latest version.

    Let me know. Thank you. I have tried googling that failure but it seems like only foreign ppl have that trouble. Odd.

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