RE: single 16GB DDR3 in a dell 7500 or dell 5500 precision
As I recall there are 6 slots. You can use 16 gig modules. But they cant be joes crab shack ram or any ole tom rick and harry ram from zualili land. SR stands for SINGLE RANK, DR stands for DUAL RANK, QR stands for QUAD RANK.
And they must match in sets of 3. and these are not Fully Buffered ram modules. Still remains you cannot mix speeds and density and size. 240pin PC3-10600 1333MHz DDR3 RDIMM
The White Slots are the first bank of 3. You put them in interleaved order. 1 4 2 5 3 6