My PC Reboots -- Maybe Overheating?

[k0ala]

Having a problem.

PC reboots.

SpeedFan says "Remote 1" is at 67C and "Remote 2" is 37C. "Local" "Temp 1" "Temp 2" Temp 3" and "Core" are all in 30-37 range.



I think it's something wrong on my video cards. But I put aftermarket coolers on and I'm still getting a high temp reading.

Edit 1:

Looks like my northbridge is getting stupid hot. These guys are getting the same result.
http://forums.guru3d.com/showthread.php?t=297275
http://www.overclock.net/amd-motherboard...build.html

[k0ala]

I find a lot of different things when I search for ms-7577 hot northbridge .
First I need to find the northbridge so I can put my hand on it and see. I'm putting my hand on all the heat sinks I can reach and they all feel fine.

[k0ala]

This time I had SpeedFan on as I ran some benchmarks, and ran it up to SEVENTY DEGREES CELSIUS and right about then everything blinked off and I had to unplug it to get it to boot.
OK. That's a nice round number, and a low one, considering. I might have melted my motherboard, if it didn't have that failsafe.

Well, I had the silver paste out, may as well use it.

I stripped my system down to the motherboard, and pulled the motherboard out.
The heat sink assembly for the Northbridge and Southbridge chips was just held on with screws. I scraped off the old transfer material (pink) and put new silver paste down, and put everything back together.

"Remote1" temp has been reduced from 70C (immediate reboot) to... 53C  :-[ That's OK, but not good enough.

I'm posting from it so it isn't too bad.

Going to leave the case open, there are a few more things I'd like to play with and I think I'll be in and out of there.

[k0ala]

After a quick burn-in session of TF2, it's no longer rebooting and that's awesome -- but what the hell is getting it so hot? I blew the dust out from everywhere, and I disassembled it down to the motherboard standoffs. Thinking of getting my hands on a couple Antec Spotcoolers since these passive heatsinks on the northbridge and southbridge are not doing the job any more.

[at0m]

Was about to say, if you're not getting transfer from the chip (where the sensor is) to the heatsink, it won't feel warm. Also, the thermal mass of most heatsinks is so high they'll only feel lukewarm even though the chip may be roasting.

Usually the thermal alarm temperature can be adjusted in the BIOS, btw.

[k0ala]

Ah ha, one of the cable bundles for secondary motherboard power was laid over that heatsink.

It's not long enough to go around any other way.
Time to get the molex tools and make a new cable.