ASUS LGA1366 Xeon Intel X58 DDR3 1333 Quad CrossFireX and 3-Way SLI USB3.0 ATX Workstation Motherboard P6X58-E WS Intel LGA1366 Platform / Intel X58, ICH10R chipset Best 3-Way SLI Performance on Triple True PCIe X16 links Built-in Dual Intel Server-Class Gigabit LAN True USB3.0 and SATA 6Gb/s Support - Fully Unleash Performance AI Suite II - One-stop Access to Innovative ASUS Features CPU: Socket 1366, QPI upto 6.4GT/s; Supports Intel Dynamic Speed Technology; Chipset: Intel X58 + ICH10R + Nvidia NF200 Memory: 6x DDR3-2000(O.C.)/1866(O.C.)/1800(O.C.)/1600(O.C.)/1333/1066 DIMMs, Triple Channel, ECC/Non-ECC, Unbuffered, Max Capacity 24GB Slots: 5x PCI-Express 2.0x16 Slots(two run at x8, Support ATI Quad CrossFireX/ CrossFireX& nVidia 3-Way SLI); 1x PCI-Express x1 Slot SATA: 6x SATA2 Ports, Support RAID 0/ 1/ 5/ 10; 2x SATA3 Ports, Support RAID 0/ 1 Audio: Realtek ALC889 8-Channel High Definition Audio CODEC, w/ Jack-Sensing LAN: Dual Intel 82574L Gigabit Ethernet Controller Ports: 12x USB 2.0 Ports (6 rear, 6 by headers); 2x USB 3.0 Ports; 1x PS/2 Port; 2x IEEE 1394a Ports (1 rear, 1 by header); 1x Optical S/PDIF Out; 1x Coaxial S/PDIF Out; 2x RJ45 LAN Ports; Audio I/O Jacks