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OC'ing FX8350 - screen freezing during Prime95 testing

post #1 of 8
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I've been playing around with the OC settings for my new rig:
- FX8350
- Asus Sabertooth FX990 R2.0 MB
- 4x2 GB DDR3 1600 ADATA RAM (this was checked to be compatible with mobo)

I've gotten hardware failures right away in Prime95 at 5.0Ghz with 1.41V. So I brought it down to 4.9Ghz with 1.41V, and ran a Prime95 test. It was fine the first 30 minutes - temperature was well below the 61C limit and had no failures. I came back to check 3 hours later and my screen had frozen - cursor frozen, no inputs recognized, and only a hard power reset was the only solution. On the frozen screen, I had Prime95's window opened and saw that no hardware failures had occurred and temperature was still fine at the time it froze.

I use the Blend option which tests a lot of RAM.

I'm wondering if this might be a memory problem? In the BIOS, I've left memory frequency, CPU/NB frequency, and HT link speed all on auto. Am I suppose to configure these as well when I OC'd (I used clock multiplier to OC). Looking at the voltages for all the different components, all the voltages are below 1.5V, with the exception of CPU VDDA voltage, which was at 2.5 (I googled this and I think this is normal).

I don't know much about RAM - CPU connections, but here's some stats from CPU-Z on my RAM. Does anything look off?


Any help or suggestions would be great! I'm pretty new when it comes to OC'ing
post #2 of 8
First approximation is that 1.41v seems rather low for a stable OC @4.9GHz.
Start here, you should be able to get it 24/7 usable with your setup.
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post #3 of 8
To test if your RAM is OK, you must... test the RAM. One less precise tool is Windows' built in memory diagnostic tool (it's in Win7, have no idea about Windows8). A more precise one is "memtest".

However, as p4inkll3r said, your voltage is rather low for 4.9Ghz, so more likely, simply the CPU needs more voltage. The harder the RAM is stressed, the more the integrated memory controller inside the CPU is stressed. To cope with the stress, it needs more voltage. Blend is quite stressful, so before blaming the RAM itself, it's more likely you simply give insufficient voltage.
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post #4 of 8
As others have mentioned no way will it run stable at 4.9GHz with only 1.41v. Most take closer to 1.5v even at 4.8GHz.
4.8GHz is where most find a voltage wall.

Read the guide linked above and start low and make small increases and semi stabilize each step before proceeding higher. You'll have much better luck.
At 5.0GHz many need closer to 1.6v and this requires a very capable cooling solution (usually WCing).

The more items you manually enter into bios the better your chances of success so yes, you'll need to research/read through the thread linked above and manually enter CPU/NB freq, memory freq (plus all other memory specs) and HT Link Speed etc.

Post back either here or in the thread above for additional help.
It would be very helpful for those helping you if you'd fill out your "Rig Sig" so we know all what you're running.
http://www.overclock.net/t/1258253/how-to-put-your-rig-in-your-sig
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post #5 of 8
If you can boot that machine at 5 GHz at 1.41v and run Prime even for a half-hour at 4.9 GHz, you already have one hell of a good chip. Most 8350's wouldn't make it into Windows at 1.41v at those speeds, some won't even POST. It took 1.48 for me to hit 4.85 GHz stable, and I had to fiddle with the reference clock to make that happen. Try about 1.45-1.46 and see if that gets you stable.

5 GHz stable at 1.41 wouldn't be a golden chip, it would be a platinum one. Even the FX-9590 at 4.7/5.0 turbo, a chip cherry-picked by AMD for high speeds, calls for 1.5v.
     
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post #6 of 8
Thread Starter 
Hey guys,

Thanks for all the great replies. It seems the consensus is that I'm just jumping a bit too high too fast, so I'll definitely bring it back down and test from the ground up! I'll do more research on all the other options in the BIOS as well, and hopefully given some time I"ll be back with some stable results! I guess I jumped the gun here w/ OC'ing up to 4.9Ghz immediately because my last build waay back was with a E6300 core2duo, and that thing overclocked from 1.86Ghz to 2.7Ghz on a stock heatsink and have lasted for the past 6 years. Guess things were a bit different back then.

I'll post once i get some results. Thanks again for all the help.
post #7 of 8
Thread Starter 
Currently testing 4.6Ghz @ 1.42V, been 4 hours and so far so good.

Quick question: even though I manually set 1.42V in BIOS, I noticed that CPU-Z reports the core voltage is actually fluctuating around 1.44-1.45V), and while running Prime95, the voltage fluctuates within 1.488-1.5V. Is this normal? Is some aspect of the voltage still being automatically regulated?
Edited by gdavge2003 - 10/19/14 at 10:14pm
post #8 of 8
Quote:
Originally Posted by gdavge2003 View Post

Currently testing 4.6Ghz @ 1.42V, been 4 hours and so far so good.

Quick question: even though I manually set 1.42V in BIOS, I noticed that CPU-Z reports the core voltage is actually fluctuating around 1.44-1.45V), and while running Prime95, the voltage fluctuates within 1.488-1.5V. Is this normal? Is some aspect of the voltage still being automatically regulated?
It is normal if your LLC (load-line-calibration) is set on very high or extreme.
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