Why is my CPU so hot?
November 2, 2013 5:41 PM Subscribe
...or is it?
For the last month or so, my PC (Windows 7, home-built ASUS P8B WS mobo, Xeon E3-1240 v2 Ivy Bridge, AMD FirePro V5900) has been abruptly shutting down (acting like a reset, everything immediately powers off including fans, power LED, etc, then reboots on its own) usually when doing graphically intensive things. I believe the CPU is hitting its thermal max & shutting down, but the evidence is mixed: if I take a look at the CPU temp in the BIOS monitor on restart immediately after one of these events, it's cool (40ish C) and if I continue into Windows and look at CPU temps in SpeedFan, I begin to get puzzled: Core0 through Core 3 temps vary around 30C at idle, but the "CPU" temp is up in the 80-90C range.
Why could be causing the elevated temps at idle and why the discrepancy between temps described above?
posted by skyscraper to computers & internet (19 answers total) 2 users marked this as a favorite
Machine had been running fine for a year (although I never had cause to look at CPU temp).
I took it into a repair shop & they diagnosed the high temp shutdown, reapplied thermal paste, ran under 100% load for a day with CPU temps in the 60C range (not sure what they used to monitor temps). I got the machine home and got an immediate shutdown first time I tried one of the things which had been causing problems for me.
Things the shop checked at min, probably others:
Hard drive OK
graphic card OK
Cooling fans all running
Power supply OK
BIOS and graphics drivers are up to date.
The thing guaranteed to cause shutdown: scrolling through the slide strip thingy in Adobe Lightbox. Other incidents in AutoCAD, Sketchup with large models and Dynascape (landscape design).
What the heck is going on? Things run OKish at low loads, but I need to be able push it hard. I'm worried about frying the CPU, too.