Chipset nVIDIA nForce4 SLI / nForce4 MCP-SLI MEMORY Support Dual Channel DDR2 533/667 MHz 4 x DDR2 DIMM Memory Slot Max. Supports up to 4GB Memory EXPANSION SLOT 3 x PCI Slots 2 x PCI-E x1 Slot 2 x PCI-E x16 Slot (SLI x8) REAR I/O 1 x PS/2 Mouse 1 x PS/2 Keyboard 4 x USB 2.0 Port 1 x COM Port 1 x Printer Port 1 x RJ-45 Port 3 x Audio Connector INTERNAL I/O 3 x USB 2.0 Header 4 x SATA Connector 2 x IDE Connector 1 x Floppy Connector 1 x CD-IN Header 1 x S/PDIF-IN Header 1 x S/PDIF-OUT Header 1 x CPU FAN Header 1 x System FAN Header Please do not forget to check with our site as often as possible in order to stay updated on the latest drivers, software and games. Note: Try to set a system restore point before installing a device driver. It will help you restore system if installed driver not complete.