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Thread: i7 920 & ex58-ud3r... 3.8GHz OC help please




  1. #21
    Lsdmeasap's Avatar
    Lsdmeasap is offline GIGABYTE Guru
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    Default Re: i7 920 & ex58-ud3r... 3.8GHz OC help please

    CPU-z only shows what is programmed into your chip for JEDEC Standard, unless you do not see a XMP section or your ram specs where you bought them say 1.5V then that would likely not be want you want to use.

    If you do have cheaper or budget series ram then it may use 1.5V, of course you can run that if it is stable but most Triple channel kits are setup for tighter timings at 1.65.

    See here is my Crucial kit, on the left in Red is JEDEC Standard for DDR3 (Timings and voltages) and on the right in Blue is XMP Programmed Stock Specs (Timings and Voltages) for my ram >>



    Now of course not all ram is programmed with XMP Profiles. If you are unsure about your ram give me the model # or a link to where you bought it and I can look for you.

    Lower voltages is of course better, but I was just trying to make sure you understand what you are looking at and what your stock spec would be.

    * Pre post edit *

    Sorry, Forgot you likely posted your ram info on page one. I looked up your model # and you do have budget 1.5V ram, so 1.5 should be what is stable for you at 999-24 @ 1333Mhz.
    Newegg.com - CORSAIR XMS3 6GB (3 x 2GB) 240-Pin DDR3 SDRAM DDR3 1333 (PC3 10666) Triple Channel Kit Desktop Memory - Desktop Memory

    Not sure about your power usage, was this during the same exact time periods and using the same tests? If not that could be why, as I would assume the higher Blck should use more

    Your settings look perfectly fine!

  2. #22
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    Default Re: i7 920 & ex58-ud3r... 3.8GHz OC help please

    The power readings in HWmonitor were taken during a Prime95 Blend test...
    Right now I'm seeing 109.67Wmin - 114.31Wmax @ full load (200bclk x 19).
    Other readings were taken under full Prime load too.

  3. #23

    Default Re: i7 920 & ex58-ud3r... 3.8GHz OC help please

    Quote Originally Posted by someguyonapc View Post
    Thanks again, Lsd..

    One other thing...
    I checked HWmonitor for processor power usage and noticed something interesting.
    For both overclocks below I used the same voltage settings.

    181bclk x 21 = 3.8GHz
    Power 147.34W min; 152.7W max

    200bclk x 19 = 3.8GHz
    Power 109.67W min; 114.31W max

    Can you explain why there's such a difference?
    Hmm, I don't know if I trust software readings, I have my box plugged through an actual Watt-meter...I'll do a comparison to HWMonitor though, should be interesting...

    [UPDATE]: Well, fail for HWMonitor. My watt-meter shows my load-idle difference as 170W, while HW Monitor only shows the difference as 110W. I doubt my memory is using an extra 60W :p to explain HWMonitor readings...

    Although the numbers aren't correct at all, the trend in HWMonitor may still be correct. I still have major problems trusting software power usage numbers though...
    Last edited by demonsavatar; 05-10-2009 at 12:12 AM.
    i7 920 C0/C1 3841A
    24/7 OC: 21x183Mhz = 3.84Ghz @ stock Vcore/QPI voltages
    Thermalright Ultra-120 Extreme 1366
    3x2GB OCZ DDR1600 OCZ3P1600LV6GK
    EX58-UD4P BIOS F11
    EVGA GTX 260 Core 216 SC 55nm 896-P3-1257-AR
    Antec NEO HE 550 Power Supply

  4. #24
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    Default Re: i7 920 & ex58-ud3r... 3.8GHz OC help please

    Quote Originally Posted by demonsavatar View Post
    Hmm, I don't know if I trust software readings, I have my box plugged through an actual Watt-meter...I'll do a comparison to HWMonitor though, should be interesting...
    Please post back with your results.
    I'm really curious to see.

    **edit**
    I see your results and would like to hear from others as well.
    I'd get a Watt meter but I can't afford one right now.
    Last edited by someguyonapc; 05-10-2009 at 12:17 AM.

  5. #25
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    Default Re: i7 920 & ex58-ud3r... 3.8GHz OC help please

    Everest is showing a similar difference in Watts used...

  6. #26

    Default Re: i7 920 & ex58-ud3r... 3.8GHz OC help please

    Quote Originally Posted by someguyonapc View Post
    Everest is showing a similar difference in Watts used...
    I'm sure almost all the software that attempts to read power readings from the CPU will give similar (incorrect) results. I would try the 200x19 setting myself, but like I said, my CPU hates 200BCLK and requires a larger voltage than when running at 210BCLK.

    What were all your voltages at 181x21 and 200x19?
    i7 920 C0/C1 3841A
    24/7 OC: 21x183Mhz = 3.84Ghz @ stock Vcore/QPI voltages
    Thermalright Ultra-120 Extreme 1366
    3x2GB OCZ DDR1600 OCZ3P1600LV6GK
    EX58-UD4P BIOS F11
    EVGA GTX 260 Core 216 SC 55nm 896-P3-1257-AR
    Antec NEO HE 550 Power Supply

  7. #27
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    Default Re: i7 920 & ex58-ud3r... 3.8GHz OC help please

    Hi all, i've oc'd my I7 920 D0 stepping proc to 3.8Ghz and am pretty happy with it at the moment.

    Sailed through Crysis warhead nicely and havn't had any problems at all. However when i am stressing the cpu using Prime95 the temps jump up to 85 degrees on the first core and tail off on the others (85, 83, 83, 80)

    This sems normal when reading what you've all put.

    My question is this: Why isn't the cpu cooler fan speeding up to compensate for this temperature? or am i being dumb and its just too quiet haha.
    Using the Akasa Nero cooler btw ~

    Corsair 1600Mhz 6Gb ram
    EX58 - UD3R F6 BIOS

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