What does an overheating CPU act like?

Nickand5

Distinguished
Nov 15, 2008
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I have a system that I am running Kubuntu on and it freezes after running about 3 mins. no matter what it is doing (sitting on logon screen, running apps, loading up, etc.) The hard drive is from another system, but the PS, Mobo, Ram are all new. I was wondering if an overheating CPU will just cause the system to freeze like that?