in B1 B2 A1 A2 the PC wont post if there are no dimms in C2 C1 D2 D1
if I have sticks in b1 a1 c1 d1 the board sees them according to the bios but reports 16GB, windows the same, hwinfo shows there is 32GB but only half is addressed
also if i stick all 4 in c2 c1 d2 d1 it still only sees 16GB...