We have been donated several HP servers lovingly referred to as "Citadel Machines".
Some of them are HP DL360 G7s, which are 1U rackmount servers with 4 bays for 2.5" SAS hard drives. They feature two 6-core 3.47GHz Xeon X5690 processors.
They similar to the HP Proliant DL380 G7s, and many hardware details (RAID controller, ILO, etc.) should be the same or very similar.