ASUS Z7S WS SERVER BOARD - Intel 5400 Server Chipset ( Dual-Core Intel� Xeon� Processor 5100/5200, Quad-Core Intel Xeon 5300/5400 Sequence).- 2 x Socket LGA771 - 4-channel x DIMM DDR2 800/667/533 Reg ( upto 24GB ). ECC Memory Size: 512 MB, 1 GB, 2GB, 4GB ; MIO PCIe x1 (ASUS proprietary) ; PCIe x16 slot (x16 link); PCI-X x1 ; PCIe x16 slot (x16 link); PCI x1 ; PCIe x16 slot (x8 link). IDE Controller: Intel� ESB2E ICH: 1 x Single Channel Bus Master IDE support UltraATA 100/66/33; SATA Controller: Intel� ESB2E ICH:6 SATA2 300MB/s ports; Intel� Matrix Storage (for Windows only) (Support RAID Software 0, 1). LAN: 2 x Marvell 88E8056 Dual Gb LAN support teaming function; Realtek 888S 8-channel High-Definition Audio CODEC - FSB 1600/1333/1066 MHz