Dell System Board for OptiPlex SX280 - Supported CPU(s):Intel Celeron D Processor, Intel Pentium 4 Processor - FSB Speed:800 MHz - CPU Socket Type:LGA775 - Chipset:Intel 945G Express - Number of Memory Controllers:2 - Supported Memory Standard(s) - PC2-3200 (DDR2-400) - Maximum Installed Memory: 2 GB - Expansion Slots: PCI - Storage Controller: Serial-ATA (ATA-6) Ultra ATA/100 - Network: Gigabit Ethernet - Connectors/Ports:Serial: Parallel, USB 2.0, Audio-Out,Audio-In, Microphone, Video-Out, RJ-45 (Ethernet)