we have a motherbaord from a Dell XPS 8300 that I removed the CPU from and put in another Motherboard(long story/not relevant). but I purchased a dell optiplex 390 sff on ebay and the pdf on it I dl'ed says it uses a LGA1155 socket. what all chips could I actually put in that? and are the 2 motherbaords compatable with the same chips. they do use the same memory chips. could I put a different cpu other than the 3 listed that they sold with in the Opt 390 ? Sorry if this is a stupid question.. I have basically done many part swaps in the past, but when it gets to cpu's I have only swapped one, from an old motherboard to an identical motherboard.