Overcloking and graphics performance

I overclocked my i7 920 from 2.66 to 3.6 ghZ. Everything runs fine, but when I tested with 3Dmark Vantage I saw that I have lower results on graphics with 3.6 ghZ and higher with the original clock of 2.66 ghZ :S. How is this possibale?

P.S I have Asus p6T Deluxe V2 motherboard, 9800 GT 1GB GDDR3 low power GPU.
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  1. The processor is getting hot and throttling it's self down to a much slower speed?
  2. No everything runs fine. I will give you complete specification of my system:

    My Computer Specification:

    Motherboard: P6T Deluxe v2, LGA1366 X58; bios 0704

    CPU: Intel I7 920 2.66 GHz

    RAM: 6 GB DDR3 1333 MHz KingMax

    Graphic Card: Galaxy Nvidia 9800 GT 1 GB GDDR3 Low Power Consumption, HDMI

    HDD: 1TB Samsung 32 MB Cache SATA

    500 Western Digital 32 MB Cache SATA

    Optical Device: LG DVD R/RW 16X

    Mouse: Microsoft Intelli Wireless Laser Mouse 6000

    Keyboard: Deluxe

    Speakers: Genius 2+1 Sound System

    Monitor: Samsung Sync Master T220 LCD Monitor 20000:1

    COOLING System:


    Cooler Master HAF 922

    1 x 230mm Fan-Front

    1 x 120mm Fan-Bottom

    1 x 230mm Fan-Top

    1 x 120mm Fan-Back

    2 x 120mm Fan-Side

    1 x 40mm Fan-Mother Board-Chipset

    CPU Cooler:

    Cooler Master V10 200w 2x120 Cooling Fans

    Other Equipment:

    · Mustek UPS 1000W

    · Power Supply: Deluxe 700W

    This is second OC’ on this machine. So far everything is tested and it’s stable. I will not go over 3.6 because of my 1333 ddr3. It is risky to go over/overclock 1446 Mhz, I may burn the RAM. When I will buy 1600 or higher it will not be a problem :D

    I am quite satisfied with the processor's voltage. Currently it is 1.225 V. I expected to encounter instability with such a low voltage, but I was wrong(lucky me :D )

    2nd O.C’:

    Spec(Orginal): *Intel i7 920 2.66 GHz

    *DDR3: 1330

    OverClocK: *Intel i7 920 3.6 GHz


    Cpu ratio: 20;
    BCLK: 180;
    Dram Frequency: 1446 mHz;

    UCLK: 2893;

    QPI Link: Auto;

    Cpu Voltage: 1.225000;

    CPU PLL: Auto;

    QPI/DRAM Voltage: 1.3

    Dram BUS Voltage: 1.5(JEDEC STANDARD)

    Prime95 Time: 6 Hours without problem

    Prime95 Temperature MIN/MAX Celsius: 64/67 C

    Intel Burn Test:

    -Every stress level with AUTO threads-OK

    -Standard 8 threads-OK

    -After standard, every stress level with 8 threads after one pass FAILED

    Intel Burn Test Temperature MIN/MAX C: 60/64 C

    MemTest86+ 4.0: OK(Two hours of testing, 2 passes-OK)

    +12 V: 11.42 V/11.62 V

    I just cannot understand why I am getting lower result on graphics test on 3DMark Vantage on overclocked system. STrange.. Any suggestions?
  3. perhaps your Deluxe 700w is drastically overrrated/failing and the OC on the CPU was just enough to take away the PSU headroom needed to keep your graphics in full juice as well.
  4. Good thinking. I will change the power supply.
  5. We are not clairvoyent, so it is entirely possible it is not a PSU issue. There are some tests you could try to narrow down the issue with. You are not getting outright power failures, just lowered performance compared to expectations. This may have nothing at all to do with the PSU.

    Try running just Furmark to stress the GPU and draw max power. Watch the temps, don't let furmark volcano your card. Note the FPS you are getting while doing so.

    Then Try running P95 AND furmark at the same time, with both stock CPU and OC. Attend this test, do not leave it running alone as Furmark can dynamite a 4870 if left to full burn.

    Furmark is almost entirely GPU based, and running P95 at the same time should only cause a small drop in FPS. If you actually see a dramatic drop in FPS by doing this test, I would consider it another signifier of a PSU that can't supply the hardware.

    BUT, as with almost anything, I recommend a clean windows installation/update, and fresh drivers as a diagnostic before you spend any money.
  6. Thanks for the advices and for your help. I will try the tests first, and then I will post the results.
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