The following for a case to fit a full size ATX motherboard. Compaq Proliant DL360 (pre HP) 1U height Dual Socket 370 One P3 500 MHz proc Four DIMMs 640 Mb RAM Two 9.1 Gig SCSI HDDs Compaq Proliant 1850R (pre HP) 3U height Dual Slot 1 Two P3 500 MHz procs Four DIMMs 768 Mb RAM Two 9.1 Gig SCSI HDDs Thanks Mica