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Phenom II x4 955 BE OC question. All help appreciated. - Page 3

post #21 of 29
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Ok one more thing what do yah think about this? Some guy recommended changing the NB frequency so I did. I'm staying very stable with what I have here.
I'm running CPU 4000MHz @ 1.4750 Volts. With NB Frequency @ 2400MHz. Idles at 32C
Prime after 5 min is 44C
post #22 of 29
There's nothing wrong with going past 1.5 assuming you can tolerate the heat. My PII needs 1.51 to get 4.0 (BSOD @ 1.5), but it's still lower than 55 degrees in Prime so it's all good.
post #23 of 29
Quote:
Originally Posted by Narzon View Post
There's nothing wrong with going past 1.5 assuming you can tolerate the heat. My PII needs 1.51 to get 4.0 (BSOD @ 1.5), but it's still lower than 55 degrees in Prime so it's all good.
Excess voltage WILL cause premature CPU degradation
    
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post #24 of 29
don't forget about the front side bus.. I think i had better readings with a 3.5xx with the fsb opened then i did with 3.8 all multi.. yea oc the nb a little but remember if your bsoding that you at that point might need to up the nb voltage as well.. Anything you overclock is possibly going to need more voltage and adds new variables to the blue screen blues...
    
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post #25 of 29
Quote:
Originally Posted by Weegsta View Post
Ok one more thing what do yah think about this? Some guy recommended changing the NB frequency so I did. I'm staying very stable with what I have here.
I'm running CPU 4000MHz @ 1.4750 Volts. With NB Frequency @ 2400MHz. Idles at 32C
Prime after 5 min is 44C
Have you tried with lower voltages? 1.475V seems high for 4GHz. I know that not all chips are created equally, but you should at least try to see if it will be stable with less volts; give your chip a longer life.


As for the CPU-NB and HTLink....
On Deneb cpus:
- HTLink likes to be at or around 2000MHz.
- CPU-NB likes to go up with CPU Speed. When I was learning to OC these chips I found a guide at another board that was quite educative and helpful. Here

There is a section there that addresses the CPU-NB speeds and how they relate to CPU Speed. From that guide you can find what the CPU-NB should be around at a given CPU Speed with this formula:
CPU-NB Frequency (+/-200) = (CPU-Frequency * 2 ) / 3.15

So in your case: CPU-NB +/- 200MHz = (4000x2)/3.15 => CPU-NB +/- 200MHz = 2539.68
So if you take the - side of the formula you get 2539.68 - 200 = 2339.68 for CPU-NB which is right around the 2400 that was recommended to you. I'd say you can leave that setting there and just give the CPU-NB voltage a small bump. Default for it is 1.100V; your board should be able to raise it in 0.025 increments... Give it 0.025 or 0.050 that should be more than enough.

I have to insist though... Try to see what the lowest CPU voltage is that will allow you to get into OS at 4GHz. Once you find that, a small bump will put you in "stability" world for sure.... And hopefully it won't be as high as you have now.

PS: Please, please... Overclock your cpu from BIOS. Don't use AMD OD for this. The SW OCing tools are known for overvolting more than the chips need.
Edited by xXSebaSXx - 6/17/11 at 9:25pm
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post #26 of 29
I have mine running at 4.0Ghz stable just by adjusting voltage and multiplier. I forget what my multiplier is, it's either 18x or 20x and my voltage is I think 1.46 or 1.47, I'm probably going to go down to 1.45 for some better temps, even though I have the voltage set to 1.47 under full load it goes up to 1.5 which I don't really think is needed.
    
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post #27 of 29
You guys really need to revise your voltages a bit...
See example:
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post #28 of 29
Quote:
Originally Posted by xXSebaSXx View Post
You guys really need to revise your voltages a bit...
See example:
no, we really dont.
You just seem to have a golden 955
    
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post #29 of 29
Quote:
Originally Posted by OutOfBalanceOX View Post
no, we really dont.
You just seem to have a golden 955

I'll agree with you on the golden 955 part, but assuming that a chip needs over 1.4V to hit 4GHz is not the way to go either. And the OP was getting instability issues in the beginning that may have very well have been caused by other factors like CPU-NB being too low. Now that he has found that CPU-NB at 2400 makes his cpu more stable; why not go back and re-tweak the cpu voltage? Remember that people that are new to OCing will most likely try to fix instability to raising cpu voltage and some times once they find the true reason for their troubles that voltage remains unchanged.

My response was aimed more at the OP and others stating that they need 1.4V+ to get to the magical number 4; I think that the advice to try and get there with the least amount of voltage needed is valid in my opinion, but to each their own I guess. I aim at the highest clocks possible with the least amount of voltage, always.
Edited by xXSebaSXx - 6/18/11 at 4:52pm
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