Four Intel® Xeon MP Processors at 2.20GHz (2MB Integrated Level 3 cache - per processor), up to 8 supported (populated in groups of 4) with 400MHz Front Side Bus and the HP developed F8 Chipset Hot Plug RAID Memory (Hot Add, Hot Replace, Hot Upgrade) 2048MB addressable protected 133MHz ECC SDRAM DIMMs (+1024 redundant memory) standard, 64GB maximum (when 2GB DIMMs are available) Two 1100/800 Watt Hot Plug Redundant Power Supplies Standard Six open Hot Plug slots (64bit/100MHz PCI-X) 4U rack-optimized modular chassis Two (2) NC7781 PCI-X Gigabit NICs (embedded)