I've been doing some self-education on CPU temps and proper maintence, etc. and came across an interesting bit of info, might be helpful.
While monitoring my CPU and system temps, I noticed that over the past month and a half or so the idle temps on my CPU had jumped about 11 degrees, from about 39c to 50c. I also noticed that my CPU Usage when idling was staying stuck at around 15%, it usually had idled at around 1% or 2%. I also noticed that my desktop was sticking, and delaying, you'd move icons or open windows and they'd stick and pause for a second before moving or opening.
No ventilation or fan issues, no abmient temp. issues, no dust issues.
Finally, I discovered the problem, quite by chance. I was in Task Manager, and was shutting down various processes to see if I could find the culprit.
It was Malwarebytes' Updater and Maintenance Processes. The second I shut down those two processes, the CPU temp dropped from about 51c to 39c, within seconds, and my CPU usage dropped down from 15% to 1%. I tried this experiment twice just to confirm it, and Malwarebytes was indeed causing it.
I have a paid subscription for Norton for my primary antivirus, but I wanted to try Malwarebytes on a trial basis just to see how it worked. Sure enough, letting it run in the background, it was gumming up my computer and raising the temps.
I don't know if Malwarebytes causes this problem in general, or with only certain processors or motherboards, etc. But I do know, as I said, it raised the temps of my i7 950 over 10 degrees, and caused desktop functioning issues.
Just wanted to pass this info long in case anyone finds it helpful.