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955 C3 trying for 4ghz

post #1 of 12
Thread Starter 
I have messed around going for 4ghz but never really tried super hard. This time I really want to get this setup stable.

Im at 3.7 now
CPU voltage: 1.35
all others are normal voltages

CPU multiplier 18.5
NB multiplier 11
HT stock x10

I have read that I will need to bump the NB speed and voltage up with the core clock speed. On my gigabyte 880ga what setting is the NB voltage, there is NB voltage and CPU NB VID voltage... Im not sure which to adjust or how high.

Thanks for any help
 
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post #2 of 12
Just deal with the core clock and voltage first and then do the cpu/nb stuff after the core is stable. You adjust the cpu/nb speed and voltage. Leave the nb voltage alone.
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post #3 of 12
start nb at 2600 1.25~1.3v and take the cpu v to 1.4 and start from there.
remember is CPU/NB not NB

ninja ._.
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post #4 of 12
Quote:
Originally Posted by razaice View Post
Just deal with the core clock and voltage first and then do the cpu/nb stuff after the core is stable. You adjust the cpu/nb speed and voltage. Leave the nb voltage alone.
^^^^^
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post #5 of 12
Thread Starter 
Quote:
Originally Posted by razaice View Post
You adjust the cpu/nb speed and voltage. Leave the nb voltage alone.
I take that to mean that I would need to adjust the CPU NB VID voltage and not the other.

I thought if there was too large of a disparity between cpu clock and nb clock it would lead to instability? Is this incorrect
 
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post #6 of 12
Pretty sure that's incorrect, but I guess I could be wrong. Increasing the cpu/nb will definitely benefit an overclock, but I don't think it would cause instability to leave it at 2000. Also, I recommend leaving the ht link at 2000. Increasing that supposedly gives no benefit and can decrease stability.
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post #7 of 12
Thread Starter 
Thanks
Ill report back in a minute and give status
 
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post #8 of 12
Thread Starter 
So I just tried 3.8ghz at 1.35v and it blue screened
I had already lowered the nb back to 2000
CPU nb voltage was left alone.

So I should just up the cpu V one notch right?
 
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post #9 of 12
Quote:
Originally Posted by Biorganic View Post
So I just tried 3.8ghz at 1.35v and it blue screened
I had already lowered the nb back to 2000
CPU nb voltage was left alone.

So I should just up the cpu V one notch right?
I say you are too low on the voltage, these chips can take up to 1.55v as far AMD says, even more if you have better cooling.

Why dont you put multiplier to 20x, and all other sutff on auto, and bump voltage to 1.5v, and see if its stable?

If its stable low voltage and test again.

Thats what i think is the easiest way, may not be the best, but for sure the easiest.
post #10 of 12
If you're going for 4ghz, just set the multplier to where it's 4 ghz. Maybe set the voltage at something like 1.45. It'll most likely be unstable, so just keep increasing it 1 tick and rechecking stability until it's stable. As a reference for you, mine is set to 1.55v for 4.2 ghz. Also make sure you don't go over 62c or 63c temp. I forget which one it is.
Edited by razaice - 7/27/11 at 8:41pm
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