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AMD Phenom II X4 955 @ 4GHz, which CPU-NB frequency?

post #1 of 7
Thread Starter 
I have overclocked my Phenom II X4 to 4GHz Prime95-stable, but I have been wondering which CPU-NB frequency would be the best for it. I have already increases the CPU-NB from 2000MHz to 2400MHz and increases the performance a lot! But setting it to 2800MHz made the benchmark results from Prime95 slightly worse, but for some reason it seemed like some games were runnig better; GMod for an example wasn't lagging as much while having a lot of physic running.

So, my question is if somebody has already experimented with it and knows a good value for the CPU-NB with a CPU core @ 4GHz ?
If not, is there a good program to test it?
post #2 of 7
2800MHz will be best for a Deneb Core CPU, You will have to increase the CPU-NB voltage to increase stability, that's why you might be seeing worse results.
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post #3 of 7
Thread Starter 
Would 1.2V be safe for the CPU-NB?
I have heard that you could turn it up to VCore level, but I am not sure...

My previous results at CPU 4GHZ and CPU-NB 2.8GHz for the CPU-NB voltage:
1.1V Bluescreen at boot.
1.125V Prime95 error immidieatly.
1.150V Prime95 error after a minute.
1.175V Prime95-stable.
post #4 of 7
1.24-1.28 would be more ideal for 2800MHz thumb.gif
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post #5 of 7
Thread Starter 
Thanks a lot, the results are WAY better now with 1.225V thumb.gif
post #6 of 7
Quote:
Originally Posted by Heavynator View Post

Thanks a lot, the results are WAY better now with 1.225V thumb.gif

Great! If possibile, try bumping the voltage up a little more, if performance doesn't increase, then tone it back down to 1.225V or if you have any BSOD's, then you will have to increase the voltage again.
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post #7 of 7
IntelBurnTest was a better stress test for my C2 Deneb.
Windows would freeze if uncore/C.P.U.-N.B. voltage was too low during I.B.T.
Edited by L4dd - 5/29/13 at 3:48pm
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