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Low voltages on Phenom II, prime95 stable but games crashing? - Page 2

post #11 of 15
The error report thing saying that the application has crashed could be because of low vcore or even low cpu nb voltage. That's about all that could be wrong:p
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Jay
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post #12 of 15
Quote:
Originally Posted by chadrew View Post

I've been messing with my Phenom II (Deneb) lately and got it running at these settings:
CPU: 3.7 GHz, voltage on Auto, CPUID shows 1.32v but drops to 1.284 on load (vdroop I guess).
CPU/NB: 2.6 GHz, 1.2v voltage
I thought the voltages might be a bit too low, but it passed 10+ hours of each prime95 test, 2 full Memtest runs, and 20 IntelBurnTest runs on Maximum. Diablo 3 crashed once during gameplay though, and this never happened before. Is it even possible to pass all these stress tests and still not have stability in games? If yes, do you think I need more CPU or CPU/NB voltage?
Sadly I wasn't able to get Diablo 3 to crash again, and I don't have any more demanding games installed at the moment.

I actually had the same issue back in the day when I was first overclocking my phII 955 on my asus m4a88td-v evo. I was able to get things prime stable for 12ish hours but under any real world use it would fail and BSOD or lock up. Raising the vcore up a tad solved the issue and I made sure I was able to run prime95 24 hours without crash.

to give you a general idea I had my cpu at 3.82Ghz @ 1.37-1.38v under load. And if I remember correctly that amounted to a BIOS setting of 1.35-1.36 with LLC enabled. My NB I had clocked just under 2700Mhz at a cpu/nb voltage of 1.185(or something right around that) and cpu/nb LLC enabled with gave it about 1.2-1.22v under load. Those were my stable settings. Ill have to see if I can dig up any screen shots to help ya out a bit more.

Hope this helps ya out and feel free to pm me with any questions you have as well.
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post #13 of 15
Thread Starter 
Thanks man, seeing some numbers for comparison really helps. My CPU/NB is at 1.25v right now, so that should be enough. Vcore is lower at 1.35 normal / 1.32 load (what can I say, I don't like LLC) so if I get crashes again I'll raise it a bit.
post #14 of 15
Quote:
Originally Posted by chadrew View Post

LLC isn't very good on my MB, it's either Enabled or Disabled (no fine-tuning) and it significantly increases voltage on load, which I don't like. Guess I'll just up the voltage, but do you think CPU or CPU/NB is the problem here?
In regards to the unlock, I'm 99% percent sure that the cores aren't faulty as I was running it with a bit higher voltage at 3.6 GHz without any problems for over a year. But I didn't have any CPU/NB overclock. I just learned recently that it's supposed to be pretty effective smile.gif

That's exactly what's needed though.

For example I can run my 1100T @ 3925mhz @ 1.450vcore -- when running prime though it goes up to 1.499vcore because that's what the chip needs to fulfill it's function at the given time (100% CPU usage on all cores)

In this way I don't have to run 1.499vcore all the time, only when the CPU needs it, while it idles at 1.400-1.450vcore.
    
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post #15 of 15
I did some testing with the voltages after I found that my boards auto setting put the vcore at 1.5v. I found that stock 3.4Ghz is fastest at 1.296 under load. It would pass every test I threw at it even down to 1.25v but would crash in games after a while.

Don't just go by pass/fail on the tests, you need to see the performance at that voltage. Like I said, 1.296v is fastest at 3.4Ghz, but at 1.25v it one or two cores were significantly slower on the Cinebench CPU test and the score was almost half the 1.296 run. Also, sometimes CPUZ reports the CPU speed incorrectly at low voltages, a sign you should bump it up a bit.
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Longterm upgrader
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