Dell tells me my 084J0R motherboard won't handle greater than 8GB (2 slots) (Windows 7 Pro OS). They said I should find a motherboard product #'s 14GRJ or 6M1YN with the same bios as the 084J0R. They said these boards would handle 16GB. Dead end on those product #'s. Anyone got a suggestion and or successful experience on in just pushing the current memory to 16GB on this motherboard??