The RMC6440A-A is a 4U high rackmount computer supporting a standard ATX motherboard with Intel Core Ultra processors . It features 3 x 5.25" external, 1 x 3.5" external drive bays, 2 x easy swap rear fans & front access dual USB ports, and a front drive panel door with keylock. Designed to serve in a wide range of applications, the RMC6440A-A offers flexible system configurations such as additional storage space, removable drive bay options, add-on cards, graphic cards, and Windows OS.