A 3U rackmount is primarily intended for use in industrial settings, where the advantages of durability and economical use of space become highly desirable features when it comes to looking for a computer.
The RMC5015 is a short depth low priced 1U rackmount computer. It includes an Atom 330 Dual Core 1.6GHz processor, DDR2 memory up to 2GB, 1 x 3.5" interal hard drive bay, and 200W low noise ATX power supply.
The RMC 9430 is a 3U Rackmount Server Case w/16 Hot-Swappable SATA/SAS Drive Bays.