No man this is not your fans it this crap board. My config:
1G DDR 400 (2-2-2)
80Gbx2 SATA in RAID1
Asus 7900GT VGA
I have big aluminium case with 6 fans and all. I had plenty of other boards working there with no probs. Bios states my CPU temp at 48c.
I have the same problems you got. All tests appears to work but games are getting stuck with ominous sound loop and blue screen later.
I have the same memory and CPU working for over a year on other mobo, so they are not the suspect, maybe its the VGA but I doubt it.