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Is one core supposed to be hotter than the other?

post #1 of 14
Thread Starter 
I just installed my Opty 165 (sck 939) and running dual Prime 95. Right now my temperatures fluxuate more than 10 degrees between the two cores.

Core 0 is about 50C and core 1 is about 58C. I have prime running affinity for one instance per core.

I haven't even touched the overclock yet because I want a prime stable stock first.

Is one core supposed to be hotter than the other?
post #2 of 14
Quote:
Originally Posted by aweir View Post
I just installed my Opty 165 (sck 939) and running dual Prime 95. Right now my temperatures fluxuate more than 10 degrees between the two cores.

Core 0 is about 50C and core 1 is about 58C. I have prime running affinity for one instance per core.

I haven't even touched the overclock yet because I want a prime stable stock first.

Is one core supposed to be hotter than the other?
There's nothing abnormal about unequal temperatures between the cores.

Your stock temperatures, though, are quite high. I'd check your HSF installation, then your VCore. (It's quite possible that you haven't reset the VCore to default value - 1.35V for Opteron dual-cores.)

Hope this helps!
    
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post #3 of 14
yes it's perfectly normal, thats quite a high difference, mine usually stay within 5C of each other but its nothing to worry about.

However those temps are a little high, check seating, use decent thermal compound and if you are not using aftermarket cooling I would advise you do - AMD's aren't great (although their 4 heatpipe ones are pretty decent)
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post #4 of 14
Thread Starter 
These tempuratures are under 100% load, and I'm using a ZALMAN CNPS7000B-Cu with a GOUGED/SCRATCHED bottom Idle twemps are around 38-40. CPU voltage is already 1.35 V

I wonder is the stock HSF better than this? The stock FSH has a four pin connector, my motherboard only has a 3 pin plug.
post #5 of 14
Quote:
Originally Posted by aweir View Post
These tempuratures are under 100% load, and I'm using a ZALMAN CNPS7000B-Cu with a GOUGED/SCRATCHED bottom

I wonder is the stock HSF better than this? The stock FSH has a four pin connector, my motherboard only has a 3 pin plug.
Make the switch and test! It's the only way to eliminate the unknown and the "what if" factor.
    
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post #6 of 14
Quote:
Originally Posted by aweir View Post
These tempuratures are under 100% load, and I'm using a ZALMAN CNPS7000B-Cu with a GOUGED/SCRATCHED bottom Idle twemps are around 38-40. CPU voltage is already 1.35 V

I wonder is the stock HSF better than this? The stock FSH has a four pin connector, my motherboard only has a 3 pin plug.
You might want to lap that zalman to get it nice and smooth, that could be the culprit.
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post #7 of 14
Anything over 3C between the cores means either the bases arn't flat, or the thermal paste isn't set on smoothly. I always reseat if my cores are 3+C difference.

You can run it like this, harm won't be done, but if you want the best temps for overclocking i'd recommend lapping.

CoreTemp atm shows my temps at:
39C
39C
39C
39C

My load temps are usually around 1-2C different across the cores.
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post #8 of 14
Thread Starter 
I was planning on doing that. I really don't know how it got all gouged, but it also looks SCORCHED on the otherside, :-0


Now I have to try the stock heat sink and see if that helps. Although I have a feelling this 5 pound hunk of copper is way better than any stock HSF.
post #9 of 14
My cores had around 5 cel difference when I had my zalman 9500 installed BACKWARDS. Now they're usually within 2-3 cel of each other at most
post #10 of 14
...my 2 cores are 7°c apart under load. ima wait a week or 2 before i reapply the as5, see if the breakin period has anything to do with it.
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