Rackmount computers generally cost more due to the drawer guides, heavier duty construction, high performance cooling (fans) and commercial duty power supplies generally not found in standard desktop systems.

Rackmount computers are generally defined by the U specification 1U is equal to 1.75 inches (1u=1.75inches). 1u, 2u, 3u, 4u, 5u, etc. Special cabinets generally ranging from 10-40U are readily available from standard and custom built computer manufacturer's like SOS2000 COMPUTER SYSTEMS. The most common type of cabinet is known as the "EIA standard" or "19-inch rackmount cabinet", where 19-inch refers to the approximate internal width of the cabinet, from mounting bracket to mounting bracket.