How do I determine the number of RAM slots in use?

How do I determine the number of RAM slots in use? which ram slot for 1 stick 1 stick of ram in it has to be 2 sticks buttt The 2nd stick doesn't register only runs 4gb it also won't work with a single stick of 8gb ram which slot apps pay real money According to the manual the DDR 5 ram is supposed to go in A2 & B2 when using two sticks i kept getting code 55 and no screen i took out 1

which slot apps pay real money It will run, but not efficiently Make certain that the RAM specifications are; 204-pin PC-10600 DDR3 SO-DIMM I also suggest that

which slot machine is most likely to win As other have posted if you have 2 sticks of ram the general rule is to put them in alternating slots So 1 stick in the first slot, miss : 8 ram slot motherboard ASUS Tuf Gaming Z790-Plus Wifi Intel Z790 Lga 1700 Atx Gaming Motherboard with 16+1 Drmos Power Stages, Pcie , Ddr4 Ram