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How to merge IMC and CPU overclocks?

post #1 of 8
Thread Starter 
Currently I am using multiplier overclocking, with ram and other components running at stock (as I don't intend to oc them). Those are some of the isolated clocks and voltages I came up with

NB-CPU overclocks @ stock CPU 3200 Hz
2000 @ 1.1v (stock)
2200 @ 1.1v
2400 @ 1.1v
2600 @ 1.2v
2800 @ 1.325v

CPU overclocks with stock NB-CPU
3200 @ 1.3v (stock)
3800 @ 1.35v
3900 @ 1.45v

I really wanted to keep the cpu at 3900 Hz and tried various ways to oc the IMC with it, but can't seem to find a way keep it stable. One spot was 3900 @ 1.45v and 2400 @ 1.2v was stable under OCCT and Prime small FFTs but blew up when i run IBT/linpack and Prime large FFTs. This meant that the IMC was not stable. I kept increasing the NB-CPU voltage around 1.35v and it seemed to get even less stable with the core running at a scorching 65c! I think temperature loads is keeping any imc overclocks from staying stable with the core at 3900.

For a better overclock, is it better to keep the core at 3900/2000 is or better to drop the core down to 3800 and see if I get superior imc clocks?
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post #2 of 8
3.8GHz for CPU and higher IMC(CPU/NB) is better. Lets say 2600 for IMC
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post #3 of 8
65c?? Way too hot. It's possible that it was failing because of temperatures rather than an unstable overclock.
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post #4 of 8
Thread Starter 
If 3800 @ 1.35v & 2600 @ 1.2v does not work right out of the box, which voltage do I add first? cpu or nb? or both?
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post #5 of 8
On some of the 955 you need 1.3v for NB speed 2600 with the cpu oc.
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post #6 of 8
My IMC is a crack head I swear. 2750 NB Freq... using 1.45v but scales up to 3100 NB Freq when I bench
post #7 of 8
Quote:
Originally Posted by yoshirama View Post
If 3800 @ 1.35v & 2600 @ 1.2v does not work right out of the box, which voltage do I add first? cpu or nb? or both?
My old 955 needed 1.225v for 2600(CPU/NB) and 1.42V for 3.8GHz(CPU)
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post #8 of 8
Thread Starter 
Quote:
Originally Posted by savagebunny View Post
My IMC is a crack head I swear. 2750 NB Freq... using 1.45v but scales up to 3100 NB Freq when I bench
Yah my cpu is kinda odd too. It goes up to 4260 Hz on a stock cooler with stock voltage when I boot it on memtest, but it can never boot into windows. I'm tempted to think if I was willing to waste money and get water cooling, maybe 4Ghz will be 24/7 stable.
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