I think Intel borked this one. Either it needs a BIOS fix, which ain't gonna happen at this point, or we both have a common failure:
I assume you probably didn't ever find a solution? I am now seeing a similar issue. On the Main screen, the BIOS reports 2x1GB sticks in Channels a & b, slot 0 but reports nothing for slot 1. Total Memory = 2048. Undeer memory configuration, the BIOS shows all 4 slots with 1024 each, but Total Memory = 2048 again. Windows 7 (64-bit) reports 3.25GB to top it all off. I have BIOS 108. I also can't seem to do the Windows Experience Index either. Stuttering in Netflix. All after several scratch loads.