Recently I had a chance to assemble/do some minor work with a couple of Opteron servers that came my way.
The servers (there are 2) are each dual Opteron models.
Celestica A2210 chassis (which composes of)
Dual SCSI hot-swap bays
LSI-chipset SCSI card (320MB/s) with external/internal connector
Dual-onboard Copper Gigabit Ethernet
Dual AMD64 Opteron 242's (1.6Ghz) ::EDIT:: Fixed retarded typo.
Dual Maxtor 15KRPM 36GB SCSI Drives.
Assembly was easy - the Celestica Chassis comes with everything besides processor, HD, and memory. Just dropped in the processors, applied the heatsinks (took me a minute to figure out that the heatsink retainer is SCREWED down), installed the drives in the bays, and dropped in some memory.
My initial impression after turning on the machines is that if I kept the servers in my house, my heating bill would be noticable reduced. These things are LOUD, and move air fast. The cooling is performed by 5 mid-mounted vertical fans that are ducted over the dual processors. I immediately dubbed the machines with the names "Leafblower" and "Vacuum" in jest - as the noise level isn't important in a DC environment.
My only real caveat with the chassis was the LSI Logic SCSI card - why put in two hot-swappable bays if you can't do hardware RAID-1? I'd be kind of iffy attempting to do any kind of swap on a running software RAID. In any case, there are two full-size PCI-X bays for you to install your own Adaptec/Mylex/3ware card if you so choose - I imagine you can just swap the SCSI cable going to the backplane for the drives from the LSI card to another SCSI card, but I did not attempt this.
A nice feature of the case was the rails that were included with it - the stationary rails literally snap onto the side of the case, and the rails themselves moved very smoothly, and seemed very sturdy. I'd imagine you could do hardware swaps on these by only extending the rails and removing the tops. ::EDIT:: (Yep, you can.)
I don't have any real impressions of the performance of the machines - at the time of assembly, the RAM for the machines had not arrived, so I threw in some DDR modules that were around just to see if they booted.