Only half of RAM detected on MSI P55-GD65

[edwardp-mh2Nk+tgbQM at public.gmane.org]

My K6-2 motherboard (DFI K6BV3+/66) requires DIMM's that are 
double-sided, otherwise the BIOS only recognizes half the amount of memory.

Perhaps that system also requires double-sided DIMM's.