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Why is my SFF overheating?

Elcs

Diamond Member
Hello all,

This is a bit of a strange one and I'll see if I can put everything down for you.

Simply put, at idle my dual core atom/ion is listing an idle CPU temp of 33C, Core temps of 71-73C across both cores, MCP of 47C and GPU temp of 42C.

Reported as per AIDA64 Extreme Edition (trial).

The parts:

ASUS AT3N7A-I motherboard (Dual core Atom with ION graphics chipset, latest bios, latest chipset/graphics drivers, 40mm fan disabled)
1 x 250 Gb WD Scorpio Blue (2.5")
1 x 2 Gb DDR2 800 Crucial (I think)
Antec ISK 300-65 case (running an 80mm Antec Tricool and 80mm Panaflo L1A at 'low' fan setting)

Testing conducted so far:

Removed the case lid, finger inspection of the heatsink revealed that it was very cool and only mildly warm to touch at the very bottom.

With fans still at low speed, temperatures on the cores reached 66-69C and 28C on the CPU, 42C MCP and GPU 37C.

With fans at high speed, temperatures on the cores reached 59-62C and 24C on the CPU, MCP 36C and GPU 31C

With the fans disabled, the temperatures on the cores surpassed 80C, CPU 44C, MCP 55C, GPU 51C, at which point I halted the test to avoid any damage. The heatsink was noticably warmer than in my initial inspection but nowhere near being too hot for prolonged finger contact. As a reference if my CPU in my Gaming PC (X2 6000+) hits 55C on both cores, my Thermalright Ultima 90 is much warmer than the heatsink in this instance.

At this moment I am not entirely sure what to do. I could re-enable the 40mm fan (really whiny and annoying) to see what that does. Reseat the heatsink and use some of the better thermal paste? Look for alternative heatsinks?

What also concerns me is that I can find no other relevant temperatures to compare to around the internet. I rather feel like this is a problem that only I am having and I am missing something completely obvious.

Any helpful insight is most appreciated.
 
The problem is that there isn't adequate airflow for the heatsink. Try to see if you can find a different fan, or manually set the fan speed to a low rating in the system BIOS.
 
Overheating... fan disabled...

You don't see a problem with that?

I have a Gigabyte Atom board (not ION, just pedestrian D510). I tried it fanless and yes it overheated. I didn't even have to run anything - just let it idle. It had an annoying 40mm fan. I "solved" the problem by using a 60mm fan with a 60-40mm adapter and undervolting the fan. It is inaudible to me from 4' away, with it inside an Antec Solo case (which is thick steel with dampening panels so that helps).
 
Have you confirmed the HSF is fully touching the CPU? If no, try giving it a slight bit of pressure while it's running, me thinks the base isn't seated right. From you mentioning the HSF is cool to the touch I would guess that proper contact isn't happening.

Otherwise I'm out of ideas.
 
Overheating... fan disabled...

You don't see a problem with that?

I have a Gigabyte Atom board (not ION, just pedestrian D510). I tried it fanless and yes it overheated. I didn't even have to run anything - just let it idle. It had an annoying 40mm fan. I "solved" the problem by using a 60mm fan with a 60-40mm adapter and undervolting the fan. It is inaudible to me from 4' away, with it inside an Antec Solo case (which is thick steel with dampening panels so that helps).

The case is tiny and the two 80mm fans blow directly onto the heatsink, straight down between the fins. These 80mm fans are about two inches away from the heatsink. The 40mm fan is situated in the middle of the heatsink, covering approximately 30% of it's surface area.

Considering the airflow coming from the two large fans, I felt that the 40mm fan was rather inconsequential.

Have you confirmed the HSF is fully touching the CPU? If no, try giving it a slight bit of pressure while it's running, me thinks the base isn't seated right. From you mentioning the HSF is cool to the touch I would guess that proper contact isn't happening.

Otherwise I'm out of ideas.

I thought I had eliminated this possibility by running the unit fanless for a short amount of time and testing the heatsink which was hot but not enough to make me expect an 80C+ reading. I gave the heatsink a firm press (not too hard) in 3 different places and also pressed along the length of the heatsink for several minutes and noticed no significant drop in temperature. It seems to be appropriately seated.

The unit has been idling for ~10 hours in an open case configuration with low fan speed. It's currently idling at 65/68C core temp and the lower area of the heatsink feels mildly warmer than my fingertips.

I'll hook up the 40mm fan again and see if that makes a difference. It may be that the heatsink is not being cooled enough in the specific spot where the cores are.
 
If you have a spare heatsink, might try taking the existing one off and just pressing a diff one on or something. Shot in the dark.
 
If you have a spare heatsink, might try taking the existing one off and just pressing a diff one on or something. Shot in the dark.

Got two solid copper ones (Thermaltake Volcano 7+'es) that I could try. The board sits flat in the case so a smidge of TIM and I can sit them on top I guess... no clips so they'd rely on weight alone.
 
get a pre-built box. they use fluid modeling and passive heatsinks to have one monster slow fan.

ask your buddy to bust out the smoke machine and black light to do your own ghetto fluid dynamics to see whats going on in there.
 
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