I have built a machine awhile back, but have had problems with it lately. I have sent the motherboard back in for a replacement. Come to find out, 1 of my ram sticks were bad, which didn't show up on the memtest before I sent the board back in. Now, it just doesn't act right. I am just wondering, how can I test my cpu, which is a phenom ii x3 720 to see if there is something wrong with it? Thanks in advance.