Not sure why you are having issues, I have five systems all with AMD Phenom II processors (945x4, 3x 715x3, 1060x6), DDR2 RAM and older AMD 7850 video cards. Have you tried downloading MemTest86, burning a CD or flashdrive and making sure the memory is okay? There are lots of tools out there for running stress tests, prime95 will give everything related to CPU and RAM a good working over. CPUID will allow you to check voltages, etc. while the system is running.
Check for a BIOS update and make sure your chipset, network, sound and video drivers are all up to date. If you have a system with internal video and are using an external video card, disable the internal video in the BIOS.
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