ASUS P3-PH4C. Maximum CPU clock speed supported: 3800 MHz, Processor family: Intel, Processor socket: Socket 775. Supported hard disk drive interfaces: ATA100. Maximum internal memory: 4 GB, Memory slots: 4x DIMM, Supported memory types: DDRII 667/533. Graphic adapter: GMA 950. Audio output channels: 5.1, Audio system: Azalia Realtek ALC883