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955 BE C3: +0.9 vCore from 3.84 to 3.9 !?!

post #1 of 17
Thread Starter 
Hi all,

Here is my problem:

I have a 955 BE C3.

I am stable at 3.84GHz with 1.41vCore but I need 1.5vCore to be stable at 3.9!

NB and ram freq./voltage are fine and stable (2600 and 1600 Cas8).

Can it be mobo related, or have I just bad luck with a bad chip?

Thanks.
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post #2 of 17
Quote:
Originally Posted by skmanu View Post
Hi all,

Here is my problem:

I have a 955 BE C3.

I am stable at 3.84GHz with 1.41vCore but I need 1.5vCore to be stable at 3.9!

NB and ram freq./voltage are fine and stable (2600 and 1600 Cas8).

Can it be mobo related, or have I just bad luck with a bad chip?

Thanks.
What temperatures are you hitting at full load?
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post #3 of 17
it's .09 not .9 lol

and that's just how some 9xx's are

i did 3.94ghz 1.46v on mine but took 1.53v for 4ghz
post #4 of 17
Thread Starter 
Lol!!

Yes, you're right 0.09 and not 0.9 (it is already 4.30 am in western Europe)!!!

Full load occt at 3.84: 54°C.
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post #5 of 17
Sounds like you're at a point of diminishing returns.
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post #6 of 17
Voltage stops scaling well after a certain point on some CPUs... looks like yours is just a little early. That sucks for a C3 too from what I've seen
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post #7 of 17
Thread Starter 
Well... Thank you for the answers... I will go to a hardware shop to buy a rope and see a sailor of my friends to learn how to make a knot...
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post #8 of 17
Quote:
Originally Posted by Dopamin3 View Post
Voltage stops scaling well after a certain point on some CPUs... looks like yours is just a little early. That sucks for a C3 too from what I've seen
Yes I agree every chip has a different "cap" plus 890 chipsets are a bit more OC friendly from my experience///
Edited by kendoman - 12/21/10 at 4:02am
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post #9 of 17
Looks like you hit a wall. Depending on binning, C3 processors will hit the voltage-scaling wall at around 3.8, 4 or 4.2Ghz. Of course, it might just be a multiplier wall you've hit; Phenom II's sometimes crap out with a multi too high, but can reach the same intended speed by upping the ref. clock.
post #10 of 17
Thread Starter 
Well, after 24 hours struggling,

I finally got it stable at 3.9 with a "bearable" temp of 58°C (3 hrs prime95).

I think it is useless to invest in a WC solution, as it need 1.55 to hit 3.95...

I hope I'll get luckier on my next cpu
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