The HP ProLiant BL685c G5 server blade, delivers no-compromise performance and expansion in the densest four processor server blade form factor available. With up to four AMD Opteron processors, 64GB of DDR2 memory, two hot plug Serial Attached SCSI (SAS) or Serial ATA (SATA) hard-drives, four embedded Gigabit NICs, and three I/O expansion slots, the HP ProLiant BL685c delivers the density you want with the performance you need to handle the most demanding enterprise class applications.