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.
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
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 )
Spec(Orginal): *Intel i7 920 2.66 GHz
OverClocK: *Intel i7 920 3.6 GHz
Cpu ratio: 20;
Dram Frequency: 1446 mHz;
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?
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.