The IBM eServer xSeries MXE-460 server is functionally identical to the xSeries 460 server, it supports the same hardware configurations. However, it is supported only as an expansion module to a base xSeries 460 and not in a stand-alone configuration. It comes configured with two empty 4-slot Memory Expansion Cards (13M7409) and two power supplies as standard, but without any processors, memory, disks, or optical drive.In addition to processors and memory, the six disk bays and six PCI-X I/O card slots in each chassis allow you to add up to a total of 48 hard disks and 48 I/O slots into a 32-way configuration, eliminating the need for an external I/O expansion enclosure.