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Vayne4800 · ‎01-31-2015

Hello,

I have been trying to overclock my PC for a while now and somehow I feel I am reaching a good peak at 4.3Ghz on the setup below:

CPU: Intel Core i7-5930K @ 3.5Ghz
Cooler: Noctua NH-U12S with two fans on pull-push setup.
MB: Asus R5E with BIOS v901.
RAM: G.Skill Ripjaw 4 16GB 4x4 DDR4-2666 15-15-15-35
Storage: Samsung 850 Pro 1TB and WD Black 3TB.
GPU: SLI EVGA Geforce GTX 980 SC ACX 2.0 @ Default with Custom Fan profile starting at 0% @ 50C and 50% @ 80C.
Case: Corsair 750D
PSU: Corsair 1200W
KB: Corsair K70
Mouse: Deathadder Chroma
Monitor: Korean IPS 27Inch 1440p OC'able.
OS: Windows 7 64 Ultimate
Case Fans: All silent 2 front, 2 top and 1 back.

The Stresstest ran for 8 hours without a hitch. Temperatures are below 90C per core and CPU average is at 81C Max. The moment the test started to halt due to finishing the run (min 479), it hangs.

Here are my BIOS Settings:
- CPU at 100x43 at VCore of 1.26V. (It peaks at 1.28V during high load)
- Cache at 3500 Mhz (which is pretty mild and even auto sets it a higher 3700Mhz) with voltage at 1.25V.
- Ram is at XMP settings but with BCLK at 100Mhz. I did add some Voltage to DRAM at 1.25V. System Agent is at default auto (0.880V).
- LLC 8, CPU Switching Freq at 500, CPU Current at 140%, All phases on Extreme, DRAM Current at 110%.
- Input Voltage at 1.91V and those other two voltages, can't recall names, from 1.05V to 1.1V. SVIDs are both disabled.
- CPU C-States and Speedstep are both disabled.

I also ran 10 loops of Realbench Benchmark without issue. Additionally, I ran 4 loops of x264 stability test without issue as well.

I feel the issue I am facing is when the CPU is going from high load to idle/normal load that causes to hang.

Oh additionally, I ran the CPU at lower speeds to get a BSOD error with BCCodes C5 or 05. Speeds were from 4.1 to 4.2 Ghz. Based on my other thread, I had success in the past on these clocks during stresstest.

Please help!

jab383 · ‎02-01-2015

The usual approach to an 'almost stable' OC is to make small voltage adjustments. Vccsa is important in Haswell-E, so I suggest trying a few .02 volt increases. You can let the cache run as high a clock as is stable and get a little better performance. I'd try for 4000MHz or whatever you can get at 1.25V. The next thing is Vcore, but make very small increases since temperatures are at the limit.

Jeff

Vayne4800 · ‎02-02-2015

Ok, here is what I did:

- CPU at 125x33 at VCore of 1.21V.
- Cache at 4000 Mhz with voltage at 1.23V.
- Ram is at 3000Mhz 15-15-15-35-T1 settings but with BCLK at 100Mhz. I did add some Voltage to DRAM at 1.365V. System Agent is at 1.14V. One notch lower from auto which was set at 1.15V.
- LLC 6, CPU Switching Freq at auto, CPU Current at 130%, All phases on Optimized, DRAM Current at 130%.
- Input Voltage at 1.91V and those other two voltages, can't recall names, from 1.05V to 1.1V. SVIDs are both disabled.
- CPU C-States Enabled and Speedstep disabled.

Realbench ran successfully for 8 hours without issues.

Vayne4800 · ‎02-08-2015

I don't think I mentioned this but apparently the freeze on halt has been known in other forums to be caused by nVidia drivers on x99 platform. Again, just conveying the findings for what its worth.

Hang on Halt!