My computer has a problem with the CPU overheating (it's usually running around 135-140 F with a nominal target of 122, but sometimes it gets over 150 or more and sometimes shuts itself down.) I'm to the point where I'm running with the case open and a fan blowing on it. I was looking at refurbished machines on Newegg, and I see you can get some pretty nice system units under $300, but would I be better off rebuilding the old machine? I have an AM3 socket, so processor upgrades are limited if I don't replace my micro-ATX motherboard, but my computer has a lot of other good parts that I don't want to go to waste like a nice Centurion case with window, Samsung 500GB harddrive that works great, and a Corsair 650W power supply. WIth the specs as follows, should I fix this old computer?
CPU - Athlon II 640 Propus quad core
RAM - 8GB - 2 Ripjaws 4 GB sticks x 2 DDR3
HDD - Samsung 500GB and Seagate 180GB
OS - windows 7 64 bit
Large Centurion case with 650W power supply
AsRock motherboard with onboard graphics (may need to upgrade to a real graphics card)
Although my replacement options for the CPU alone are limited, would that fix the overheating problem or would I have to replace the motherboard too in order to get that fixed?