Dual Xeon X5550 (2.66Ghz Quad Core, Hyper-Threaded Nehalem Based Processor. Supports MMX, SSE, SSE2, SSE3, SSE4.1, SSE4.2, Intel EIST, Intel 64, XD Bit, Intel-VT-x, Intel EPT, Intel VT-c, and Intel x8 SDDC)24GB (12x2GB), DDR3 Registered ECC RAM Installed18 RAM Sockets (6 Open) Supports up to 288GB (18x16GB) DDR3 Registered RAMSupports up to 48GB (18x4GB) DDR3 Unregistered RAMIntegrated Dual Gigabit (10/100/1000 Mbps) Ethernet Ports4 Non Hot-Swap Large Form Factor (LFF) 3.5" Hard Drive BaysSupports up to 8TB (4x2TB) SATA DrivesHP SmartArray B110i (Supports RAID 0/0+1) Supports SATA 1.5Gbps and 3Gbps SpeedsPCIe 2.0 x8 Slot460W Power Supply***200+ Available***