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Safe MAX voltage settings

post #1 of 10
Thread Starter 
I'm still tweeking my OC and managed a stable 3.9Ghz (15 minutes on Prime95). I'm trying to get to 4.0Ghz or more, but I'm not sure on the safe MAX voltage settings in the BIOS.

So far I accumulated the following safe MAX voltage settings.

CPU-NB = 1.55v max
Memory 1.6 to 1.7v max
CPU v core = 1.55v max
NB = ???

Are there any other voltage settings in the BIOS I might need to tweak in order to stabilize my OC?
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post #2 of 10
First 15 minutes of prime doesnt make it stable... do atleast 1 hr. Second i personally found out 1.55 isnt safe on cpu-nb... after 6 months i couldnt OC my nb more than 10 mhz without having to reset CMOS to post. i believe 1.35 is the max you should go
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post #3 of 10
Thread Starter 
I know 15 minutes isn't enough, I'll run Prime95 for a few hours once I'm all done. I might take the OC back down.

I don't want to make voltage changes and run Prime95 for a few hours in between every little tweak I do in the BIOS.

At the moment my CPU-NB is 1.42v.
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post #4 of 10
CPU-NB = 1.4v max
Memory 1.65v max (If you want to get it to 1.7v get a RAM Cooler, G-Skill told me about it)
CPU v core = 1.55v max
NB = ???

I have no idea about the NB, but the CPU-NB is only safe up to like 1.4v, you wrote a very dangerous digit there and 1.55v will definitely kill it.

Also CPU Vcore is fine until 1.55v but make sure temps never go above 60ºC, ideal is to keep the CPU below 58ºC.
    
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post #5 of 10
Quote:
Originally Posted by kcuestag View Post
CPU-NB = 1.4v max
Memory 1.65v max (If you want to get it to 1.7v get a RAM Cooler, G-Skill told me about it)
CPU v core = 1.55v max
NB = ???

I have no idea about the NB, but the CPU-NB is only safe up to like 1.4v, you wrote a very dangerous digit there and 1.55v will definitely kill it.

Also CPU Vcore is fine until 1.55v but make sure temps never go above 60ºC, ideal is to keep the CPU below 58ºC.
What he said...
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post #6 of 10
I always kept the NB voltage at stock (Or was it AUTO? ) as I didn't see it neccesary to change.
    
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post #7 of 10
I would go over 1.45V on your CPUNB, i've been running 2.9Ghz @ 1.45 for a few mon,ths and it's still rock stable.

With thubans you shouldn't even need to go over 1.45V to get 3Ghz CPUNB.


But i have ran benchmarks at 1.6V on my cpunb
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post #8 of 10
Thread Starter 
Ok, thanks for the info.

My issue is that I couldn't get up past 3.8Ghz simply by increasing the multi and increasing the vcore to 1.55v. (stock NB)

I would keep getting number rounding errors in the result.txt with Prime95, something about expecting 0.4, but received 0.5.

I was told these errors are caused by memory and\\or CPU-NB, so I increased the memory and CPU-NB and increased the multi to 3.9Ghz and it worked! no more errors in the result.txt.

So I increased to 4.0Ghz, but now I'm back with the same result.txt rounding errors. I'm assuming I need to increase either the memory or CPU-NB voltage, but I wanted to know the MAX safe values.
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post #9 of 10
Quote:
Originally Posted by thestef View Post
Ok, thanks for the info.

My issue is that I couldn't get up past 3.8Ghz simply by increasing the multi and increasing the vcore to 1.55v. (stock NB)

I would keep getting number rounding errors in the result.txt with Prime95, something about expecting 0.4, but received 0.5.

I was told these errors are caused by memory and\\or CPU-NB, so I increased the memory and CPU-NB and increased the multi to 3.9Ghz and it worked! no more errors in the result.txt.

So I increased to 4.0Ghz, but now I'm back with the same result.txt rounding errors. I'm assuming I need to increase either the memory or CPU-NB voltage, but I wanted to know the MAX safe values.
You may just need to increase the speeds rather than voltage. What are you running the CPU-NB speed at? Memory?
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post #10 of 10
Thread Starter 
I tried to increase the NB speed but it did't help, so I left it at 2000Mhz for now. I'm focusing on getting a stable CPU OC at 4.0Ghz, then I'll increase the NB.

Are any of you guys looking at the Prime95 result.txt for any errors? or are you relying simply on system stability while runing Prime95?
Edited by thestef - 5/13/11 at 10:21am
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