Memory or CPU issue?

[Boardin087]

Okay well i picked up an a8n5x mobo and I cannot run my mushkin memory in dual channel (as soon as i put a 2nd stick in a get a repeated "BIOS ROM CHECKSUM ERROR" I used the auto flash utility and talked to asus. They wanted to konw if my memory is compatible with my mobo. Im not sure I had trouble finding it on the mushkin site. Its in my sig its mushkin pc3500 hi perf lvl 2. I went out and bough some cheap Bestbuy ram to return when im done messing with it and it worked fine but since they were different sticks (thanks alot bestbuy) it ran 1gb in single channel not dual. Im wondering if my memory controller on my chip cant handle dual channel or if my memory is uncompatible. (cpu is new so its a possibility is bad, already rmaed the board and they fixed some other issues i was having)