I just put together this system booted it with 2 trancend ddr400 256 single sided eight chip dimms in only the first two dimm sockets. xp pro installed okay, booted up registry error. Then the mouse froze. I pulled the dimm out of the socket 2, problem seemed to go away then I tried a different dimm another Brand new never been used module same transcend brand and specs boom! problems returned. I moved the new stick to socket 3 so far no problems. Is this something to do with the single double sided thing or the a64 memory controller? Any info would help