Thanks a bunch for those links, Andy. I'm out of town at the moment, but when I get back home this evening I'll check the markings on my CPUs and see what I have. I'm less scared now, though, because searching for the exact ID yields a whole lot more options. There are several auctions on ebay for 2 of those CPUs for $55. Not too bad IMO.

I have another problem that I don't know how to deal with, though. There's a locking mechanism on the front of the machine to prevent the removal of the hard drives. The problem is that my office seems to have lost the key with the lock in the locked position. The machine is at least 4 years old, so they have no idea where the key would have shifted to. What should I do?