Umm, I have no clue what model Proliant that is, since we never made a 4300, and we never used a "PERC2 RAID" Controller.

Being a dual P2 400, I'm guessing PL1600 or a PL3000. PL1600 is going to be similar to a normal tower chassis, but with modular parts in the back for the PCI and processor cages. PL3000 is going to be quite a bit bigger, and have probably 8 PCI slots.

The array controller I am guessing is a third party device thrown in by the past owner. All Proliant array controllers are "Smart Array" controllers, and integrate well with the server.

Did you get a SmartStart CD with the server?

edit: Actually, searching around, looks like it might be a Dell PowerEdge 4300 server with a PowerEdge Raid Controller (PERC). Can't help you with that one, never had much experience with Dell servers.