ASUS P3-PH5X GRA/SIL/BLK RET. Maximum CPU clock speed supported: 3800 MHz, Processor family: Intel, Processor socket: Socket 775. Supported hard disk drive interfaces: ATA 100. Maximum internal memory: 8 GB, Memory slots: 4x DIMM, Supported memory types: DDR2 800/667/533. Audio output channels: 7.1, Audio system: ADI AD1988A. Networking features: LAN 10/100/1000 Mbps