Fedora keeps crashing, ran memtest +86 on both memory channels, and computer freezes

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http://www.linuxquestions.org – I have a computer, I upgraded it from FC5 to Fedora 14. Thought at first I had a bad drive, as It kept crashing. After reformat & install of Fedora 14, continues to crash when doing high system resource type commands such as yum update. Thought I had bad memory, it has 4 memory slots, 4 GBs all the same brand model of memory, ran memtest +86 on first channel, and It froze in middle of the test. Removed that RAM and put in the other 2GBS in the other channel, and again it froze. So I dont think its the hard drive or RAM, Could it be the CPU? (HowTos)