I'm currently having my computer do some re-encoding of a bunch of videos to lessen the file size while maintaining just about equal visual quality (mainly for archiving onto DVDs). When doing something like this, the CPU tends to work at max load, and so it'll heat up. I'm running a Intel Core 2 Quad Q6600, OC'ed from 2.4Ghz to 3.0Ghz, and with 100% load on each core, I get the following temps... 59C, 58C, 54C, 57C I've never ran the CPU up to 100% on all cores before (no, I've never used Prime95), so I don't know if the CPU was meant to be able to handle such temperatures. Over the past hour of this, the cores have increased by 1C. It would be one thing if it wasn't going to stay at that load for long, but based on how much re-encoding I've done vs what I have left, I'm expecting a good 13 hours more before my first batch of 26 videos are finished. I have thought about finishing up the current videos being processed, and restarting my computer to set back the CPU to 2.4Ghz for this one time. Sure, it would take longer, but at least with that, I know the CPU cores won't be as hot throughout it. Edit: Decided before I go and stop the process for downclocking back to 2.4Ghz, I'd open up my case to see how much of an effect it would have. It seemed to help a bit. 56C, 55C, 49C, 54C 3-5C less with the case open than with it closed. Still unsure about how wise it is to leave it on peak load for ~13 hours, though something like Prime95 is meant to be such a test. One other thing. With my CPU being OC'ed, the VID is set at 1.2625v, just in case such information is needed to give an answer.