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OC 955be, max safe CPU voltage? Help a beginner out please :)

post #1 of 25
Thread Starter 
I switched my multiplier to 18 and got a BSOD during stresstesting with prime95. I upped the coy voltage by 0.25 volt now but can clearly see my windows is still unstable, even when typing this.

What should I do? Increase the cpu voltage even further? What about all these other voltage options? Here is a picture of my bios before ocing

My temp right now is 41 c accordong to hwmonitor by the way.
img0634i.jpg
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post #2 of 25
Vcore for Phenom/Athlon II x4's is usually 1.4v stock. So feel free to go at least that far.

Just keep it under 60 C and you can go as far as 1.6-7v (1.5'ish will be your max on air cooling probably)


Edit: 1.4v is usually what the _motherboard_ sets as "stock", my bad. Mine actually set 1.4v with LLC up to 1.43 out of box. Yes 1.6-7v is pushing it, but when kept within thermal limits is perfectly acceptable. I've suicided on 1.65v on air and stayed within tmax.

Don't forget to disable Cool'n'Quiet and power saving options
Edited by Nugu - 5/26/11 at 9:21am
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post #3 of 25
Max 24/7 voltage is 1.55, no higher. Provided the temps are still under 60c.
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post #4 of 25
Quote:
Originally Posted by Nugu;13643894 
Vcore for Phenom/Athlon II x4's is usually 1.4v stock. So feel free to go at least that far.

Just keep it under 60 C and you can go as far as 1.6-7v (1.5'ish will be your max on air cooling probably)

Are you crazy????? His stock voltage should be 1.35.

Pushing 1.7v without sub-zero cooling is absurd, don't even mention 24/7.
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post #5 of 25
BSODs are usually memory-related somehow. You might need to increase the CPU-NB or DDR3 voltage.
post #6 of 25
Thread Starter 
Thanks! The option I selected in the bios posted in the photo above is the only I should be messing with right?
Quote:
Originally Posted by t-ramp;13643927 
BSODs are usually memory-related somehow. You might need to increase the CPU-NB or DDR3 voltage.

And how much you suggest I should increase them smile.gif
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post #7 of 25
1.55v is the maximum for long term use. Watch your temps with higher voltage, needs to be under 60c in Linpack or prime95
post #8 of 25
Quote:
Originally Posted by Nugu;13643894 
Vcore for Phenom/Athlon II x4's is usually 1.4v stock. So feel free to go at least that far.

Just keep it under 60 C and you can go as far as 1.6-7v (1.5'ish will be your max on air cooling probably)

No normal Vcore is 1.35 for the 955. Either way you can safely put the vcore up to 1.55. However I dont suggest doing that all at once. You need to take it in steps. Dont touch the NB PCIe voltage. The only ones you need to think about are NV Voltage, CPU NB VID and cpu voltage. DRAM voltage should be obvious. You can bump up the NB voltages slightly on their stock air cooling and overclock the north bridge which will give you a better cpu overclock capability. 2600-2800 on the NB is pretty good. What I did on mine was overclock the cpu by multiplier a little bit, then up the NB multiplier and overclock the FSB. This got me the best overclock rather than just by multipliers alone. Good luck. 60C MAX temps, 55C for 24/7 use.
Edited by Timlander - 5/26/11 at 9:21am
post #9 of 25
Thread Starter 
Quote:
Originally Posted by timma100;13643943 
1.55v is the maximum for long term use. Watch your temps with higher voltage, needs to be under 60c in Linpack or prime95

Can't I really go past 60c during stress testing? I went 80c on a stock cooler with prime95 before I installed my new hyper 212 yesterday (see other thread)and who knows for how long my idle temps have been above 60c. As far as I can see there is no damage done to my cpu or mobo. Possibility of having a relatively strong chip?
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post #10 of 25
Stock Vcore is not 1.35V

The stock Vcore is dependant on the chip. Every chip is different. That being said the majority of 955's are 1.35Vcore.

My 555 X2 has a stock Vcore of 1.4250V
My 955 X4 had 1.35V

Max voltage is 1.55V on great air cooling. 1.6V max for water cooling. That being said temps must be good. You will see instabilities past 55C at high overclocks anyways.

By the way. Linpack or IBT will not properly stress the system. Linpack only hits on the cpu cores.

Prime 95 blend for 3 hours at the very minimum is a proper stress. It puts stress on the ram, IMC, and on the cores.
Quote:
Originally Posted by Zakka;13644025 
Can't I really go past 60c during stress testing? I went 80c on a stock cooler with prime95 before I installed my new hyper 212 yesterday (see other thread)and who knows for how long my idle temps have been above 60c. As far as I can see there is no damage done to my cpu or mobo. Possibility of having a relatively strong chip?

Going over 60C can cause damage but its likely you did not. Chips are surprisingly resiliant. It's 80C temps that will kill your chip. Idle temps should not be over 35C unless you live in a very hot climate.
Edited by Slappa - 5/26/11 at 9:33am
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