Genuine Dell CK520 Motherboard With Mounting Tray, For XPS 720 Systems Chipset: NVIDIA nForce 590 SLI MCP, Supported Processors: Intel Core 2 Duo, Inte Core 2 Extreme, Socket 775 Supported Memory: 4x 533/667-MHz DDR2, 8gb Max Total, Audio: Integrated HDA 7.1 Channel Video: PCI Express, Expansion Capabilities: 40 Pin IDE Connector, 6x SATA Connectors, 34 Pin Floppy drive connector, 3x PCI Slot, 1x PCI Express x1 Slot, 3x PCI Express x16 Slot Peripheral Interfaces: 1x IEEE 1394 Firewire Connector, 1x 10/100/1000 Network Connector, 2x PS/2 (mouse/keyboard) connectors, 6x USB 2.0 Complaint Connectors Motherboard Part Number: CK520, YU822, U723D, UY253