Orin wrote:

In article <vlqksdsjpvpuf4@corp.supernews.com>, gheston@hiwaay.net 
says...

It's overheating; either your HSF is inadequate (almost guaranteed if
you reused the one from the 950) or it's not properly installed. 

Well, I'm getting pretty convinced that might be the case. I'm using 
Falcon Rock II HSF, and have added a couple of fans blowing the hot air 
out of the case.

You might be better off with the fans blowing cool air into the case
and the PSU fan blowing the hot air out.  This prevents dust building
up in every opening in the case.
-- 
Dom