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Q6600 temp differences across cores (using Core Temp)

S

skrill

Gawd
Joined
Oct 12, 2001
Messages
670
Hey all -- question for you quad core guys.

I have a Q6600 that is currently stress testing on Prime 95 -- running on the 11th hour now.

Nice and stable.

But Core Temp is showing some pretty huge differences in temps between the difference in cores.

Core 0 is running between 48 and 51c (its the hottest)
Core 1 is running a bit lower 46 to 48c
Core3 is the lowest between 40 and 42c
Core4 is running 40 to 43c

Is this normal? Thoughts?

My setup is:

DangerDen RBX on really tight w/ AS2 (didn't have any AS5 around)
Radiator is a Black Ice II (dual 120mm with two Silenx fans on full -- still pretty quiet).
Pump is a Swifty MCP655

CPU-Z is showing between 1.210 to 1.230v on the CPU voltage.
 
My core1/2 temps average around 61. My core3/4 temps average around 58. Idle is 39, 39, 36, 37. Sometimes they have a larger or smaller spread.


You may have better contact between the one side of the processor and the water block. Or you may have better paste coverage. Or it just may be a oddity of that processor's thermal sensors.

Try re-pasting and re-seating the whole thing?
 
rainman said:
My core1/2 temps average around 61. My core3/4 temps average around 58. Idle is 39, 39, 36, 37. Sometimes they have a larger or smaller spread.


You may have better contact between the one side of the processor and the water block. Or you may have better paste coverage. Or it just may be a oddity of that processor's thermal sensors.

Try re-pasting and re-seating the whole thing?
Click to expand...

Helluva rig you have there.
 
Keep in mind you are running other software than prime 95 at the same time. (the OS is trying to do all kinds of stuff and God and Bill Gates only know how the task scheduler is splitting the work between the cores.
 
At loads i'm getting 58, 57, 54, 51. Again, could be many things (paste, poor contact/uneven surfaces, unequal tightening, etc), but it's not anything to worry about as long as your hottest core is within tolerable temp limits.

That's not to say nothing can be done about it. Some Q6600 owners have posted that their IHS is convex, so lapping that and/or the water block might help. You could also double check the distribution of your AS2. I'm not really into the whole lapping thing, and I would double check my AS5, but I've got a Geminii and that requires taking the mobo off the tray to remove it, and getting my mobo tray about out of my case is a serious PITA, so I'm just dealing...for now.
 
On my Q6600 the 2nd core is always the warmest, with the 1st core in 2nd place and the 3rd and 4th core tie for coolest. Its weird.
This is at idle and with Prime.

This was when I had the Zalman CNPS8700 and now when I have the Zalman CNPS9700 both using AS5.
 
Skrill,

Out of curiosity, what is the Batch # and the VID for your chip? The batch number can be found on the box of the processor, on the product label with the Intel hologram on the left side. It's the number under the bottom-left barcode (FPO/BATCH #.) You can read the VID in CoreTemp.

7-8c is common. As for uncommon, I've been testing a new G0 Q6600 over the weekend: Batch # L737B672. Averaged out, there is also a 7-10c difference between the hottest core set and the lowest core set, but the delta between the single hottest core and single lowest core is quite remarkable: at load it can reach 15-20C! For example, during a Prime95 stability test (3.2ghz - 400 x 8 - 1.37 vCore,) Core 0 will be 65C and Core 3 (the cool one) is a breezy 50C.

Mark.
 
I was getting 65-65-58-58 (cores 0, 1, 2, 3) initially under load...then started tightening my tuniq's screws more until they were down all the way...which was a huge PITA with it still in the case...anyways, the temps then become 65-58-58-65.

The Tuniq's backplate has 4 little pins that fit through 4 corresponding holes on the mobo, but one corner just wouldn't stay in the hole...I probably didn't make it flush with the board when I went to screw it, hence the unevenness now.

Reseating it would be a massive PITA and I'm comfortable with the temps as they are, so I don't think I'm going to bother.
 
I see the same thing with my G0 stepping Q6600 running at 3.4Ghz. Seems to be pretty normal for these chips.
 
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