Mini 1U Rackmount case developed with low-power applications in mind. Quiet 200W AC-DC power supply and zero chassis fans for a low noise-floor, perfect for smaller motherboards (Intel Atom, VIA x86, etc). Standard 19" rackmountable with a shallow 9.8" depth. Please note that standard ATX I/O shields are not compatible with 1U rackmount enclosures. The front I/O bracket included with the 503L-200B is custom designed for specific Super Micro motherboards (including the X7SPA and X7SPE motherboards)--please inquire about fit.