Corair RAM from Dell website
Thanks for answering/ I bought the RAM from Dell to be sure it was compatible with my Dell OPtiplex. Brand name is Corsair. Their instructions are poor; their picktre has sockets with all white retention levers and shows only three instead of four. As I said before, I other Dell is sitting with 4GB while only using three GB, so I need to know how to configure three GB sticks into the four sockets.