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My temps seem high on my new Phenom 955 C3 (42C idle)

alkemyst

alkemyst

No Lifer
I am going to reflash to a older BIOS as I changed my setup to the F7 BIOS (From F5C) on my Gigabyte GA-MA790XT-UD4P to ensure compatibility....seems temps start in the 40C range across the board in a 78F (26C) room.

I am cooling it with AS5 and a TRUE w/ a L1A fan. I tried remounting it, the washer method (which did lower temps a bit), and moved the fan from sucking air to blowing (seemed to help about 1 degree).

Still seems hot.

Under load stock it goes to mid/high 50's, under load 1.45V it hits mid 60's.

Seeing if anyone has pointers. I was able to run OCCT High priority/Large, and Prime95 (max heat test) concurrently for 6 hours before reboot at 3.7GHz and stock voltage.
 
That seems about right to me from what I have seen my 965 run at so nothing to be worried about idle temps are not a big deal either way so watch your max every cpu if different. ow my motherboard lcd readout is always 2c higher than say core temp just fyi you didn't say what you were using to see the temps.
 
veri745 said:
That sounds like perfectly acceptable temperatures for an overvolted CPU.
Click to expand...

42C is at stock voltage. Goes to 60C+ with 1.35V as well.

Just backed the BIOS to what I had on my 720 and no change.

Bought this as a 3.8Ghz@ 1.39V's stable chip...I don't think it really is.

My 720 ran 3.6GHz @ 1.5V for days Prime95....

Have to see if the older BIOS helps stability.
 
try a different thermal compound, and/or try reseating the cooler and see if it makes a difference. I don't like as5 that much, the tuniq tx2 i had seems to be much better.
 
Quick question: is your TRUE lapped? The base on TRUEs (and some other Thermalright products) may not be flat which may be causing problems with contact on your 955's IHS. In my experience, the two K10.5 chips I've owned have had a flat enough IHS, at least if you leave the nickel intact anyway (the copper underneath is another story).

Also, I second the motion to kick AS5 to the curb, though I doubt it is the culprit. Highly recommend x23-7783D.
 
My TRUE was extremely flat and polished from the factory. Old residue shows a pretty even contact on both the CPU and base.

I may try a different compound. I have some ShinEtsu Micro...but not sure what type as it's not identified on the syringe.
 
Shin-Etsu makes a lot of different pastes. Could be G751, could be x23-7762, who knows. It's probably G751 which frequently beats AS5 in reviews, albeit not by a large margin.

Got any static pressure numbers on the L1A? Or, more importantly, have you used that HSF + fan combo to cool a different CPU with good results?
 
Don't know what specs you need...the Panaflo L1A is pretty standard fare.

I used this combo to cool my overclocked (3.6@1.5V) Phenon 720 with peaks in the 50's. Even at 1.35V and stock clock on this chip I am hitting near 60C under load.

I think it may be G751 I have. In the whole thermal paste debate though I have seen none of the top makers produce anything that's dramatically different if cooling under air.
 
For referance my PH II 940BE OC in sig will hit 60-62C under full load, getting 1.4V. It idles at 38-42c. When i was going for 4Ghz running 1.6v(i know im nuts) it would thermal shutdown/crash as soon as it hit 67c exactly every single time, and it would hit 67c exactly 20-30 seconds into prime95.
 
It seems a little hot considering you're using one of the top coolers (what is the L1A fan, though?) and the chip is at its default voltage. If the fan runs @~1200 RPM, then I'd expect ~35C idle. If you have C1E/C'nQ enabled then it should be even lower.

AMD chips are sensitive to (ambient) temperature. Turn up the air conditioning and lower the room temperature to 70F. And open the side panel of your case and see if it makes difference. It's possible your case air circulation isn't optimal. My C2 955 BE with a shitty Zalman cooler ran ~50C max outside the case, and ~60C inside the case @3.6 GHz / 1.35V in warmish spring days (~80F). C3 should fare better, though I don't think your chip is abnormally hot. I think it's most likely ambient temp and case temp.
 
Last edited:
This was taken while running 50 loops of Linpack with my old C2 955BE @3.6 GHz. Inside the case, ambient = 70F. Zalman CNPS 9700.

 
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