Processor(s): (1) Dual-Core Intel Xeon 5160 Processor (3.00 GHz, 1333 FSB). Cache Memory: 4MB (1 x 4MB) Level 2 cache - 5100 Series. Memory: 1 GB (2 x 512 MB) Standard; PC2-5300 Fully Buffered DIMMs (DDR2-667). Network Controller: Embedded Dual NC373i Multifunction Gigabit NICs. Storage Controller: Smart Array P400i Controller with 256MB cache (RAID 0/1/5). Hard Drives: No drives included; (4) drive bays active. (6) bays supported with optional storage cable (PN 399546-B21). Internal Storage: SAS/SATA. Optical Drive: Optional CD, DVD, DVD/CD-RW, or Floppy. PCI-Express Slots: 1 full-length x8 PCI-Express slot, 1 low-profile x8 PCI-Express slot. Power Supply: (1) 700W power supply, redundant optional. Fans: 9 total, N+1 redundancy standard. Form Factor: Rack (1U), (1.75 in/4.45 cm).