I have a dell poweredge server and I've purchased 4- 8 gig memory sticks. I have ESXI server installed. I have them placed in pairs. Slots 1 and 2 and Slots 5 & 6 according to the specs. However, when I boot the machine the bios is somehow disabling slots 5 & 6 so it's only reading 1/2 the memory. If you put the memory on once entire side of the slots its' not posting.