Overclocking FX-8350, trying to get stable 4.7Ghz, P95 blend = rounding 0.5 expected 0.4?

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Benton1234

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May 31, 2014
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First of all, System
MB = Sabertooth 990FX
CPU = FX-8350
RAM = AMD Radeon 1600MHZ CAS = 9-9-9-28
GPU = XFX Black Edition R9 280X
CPU Cooler Noctua NH-U14 (Idle = 38c,98f) (Load on Watch Dogs = 53c, 129f, 55c on P95 Blend, may hit 58c)

Ok so my problem is in the title and it keeps bugging me because I have manually put in my RAM Timings, seem to have a good voltage, 1.44-1.46, and my Northbridge frequency is 2800MHZ and HT Link is 2600MHZ. it's stable all like this at 4.5ghz but when I try 4.7 P95 tells me this. It's weird because everything runs great just P95 says rounding is off, anyone have any idea to what I could do to keeps this speed? I can go back to 4.5 just really wanted that extra boost.
 
Solution
bgunner
Have you tried to lower the NB frequency and see if this helps? Also a slight voltage bump in NB may help, lowering the ram speed sometimes can help.
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Benton1234

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May 31, 2014
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Hey thanks for the advice! Lowering the NB frequency did it, just had to put it to 2600mhz vs 2800! Also during P95 blend I left it running for about 30 minutes and the CPU temp got to about 65-71c or so, I'm expecting this but it bothers me how hot it got, obviously nothing will ever push it that for besides P95 but should I be worried about that kind of temp?

Also, is it a bad idea to run the CPU this high? I know the dangers and risks but can it really lower the life expectancy even if its under cool temps and a stable setup?
 
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bgunner

bgunner

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Feb 13, 2009
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The FX series CPU's throttle the Frequency when the temps get to high. The throttling starts around 62°c but could be slightly higher depending on the chip itself. So try using you most stressful daily program, not a stress test, and watch the temps and frequency. If the frequency starts to drop and the temp is way high then it is most likely throttling to prevent heat damage.

Is it OK to run at this high temp? You should try to keep the CPU between 55°-60°C maximum for best performance and longevity. The cooler the better. If your daily programs exceed this then you should consider a different cooling solution or dropping the clocks.
 
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bgunner

bgunner

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Feb 13, 2009
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you can try to lower the core voltage and see if it is stable by running Intel Burn Test for 20 runs and on maximum stress level.
Then run Prime 95 for 5 hours. If these 2 tests pass then it is 24/7 stable. I suggest you take a week or two for testing the CPU voltages. Drop the voltage by one step and test. IF it is stable drop it one more step and test. Continue till you become unstable. Once unstable Bump up the voltage buy 2 steps and retest for stability. This pattern should yield the lowest stable voltage for your CPU at that speed.
 
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Benton1234

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May 31, 2014
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All right, sweet, again really appreciate the help because I was pulling my hair out trying to figure the best way to test stability and see where my perfect set up would be, and, I kind of have been doing what you suggested earlier and it's all been coming out stable.

Also, for others reading this, here's my full specs
Case = Cooler Master HAF XB EVO
Motherboard = Sabertooth 990FX R2.0
CPU = FX-8350 4.7Ghz stable at 1.425 - 1.45 Vcore
CPU Cooler = Noctua NH-U14 1 x 140MM
GPU = XFX Black Edition R9 280X Core = 1080Mhz Memory = 1550Mhz (Stock)
RAM - 1x8gb AMD Radeon Memory 1600Mhz CAS = 9-9-9-28
DVD-ROM = Asus DRW-24B1ST/BLK/B/AS
2x140MM B-gears blaster 110 CFM
1x120MM B-gears blaster 110 CFM
1x80MM Purex 30 CFM
 
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