Wow - just searched up this thread for my mobo and it answers something I found out the hard way last October, when I got it! I had the Samsun ram to start with and was plagued by BSOD and tried all sorts of reformat/CMOS reset/mtest86 (passes BTW) etc until I (finally) changed the RAM for Crucial and then all was well again. This is obviously likely to be it.... although my Samsung RAM was not PC400....
Anyway, solves a riddle from the past for me, just wish they had the patch out last October.... well actually no, with my luck would have crashed on the BIOS flash or something.