Northbridge Chipset: NVIDIA® nForce 750i SLI (C55) Southbridge Chipset: NVIDIA® nForce 430i Memory Support: 4 X 1/2GB DDR2 533, 667,800 Slots: One PCI Express x16, 2 PCI Express x8 One x1, Three PCI Dual-Core CPU Ready 1 Onboard IDE Channel, 4 Serial ATA2 Onboard SATA RAID 0/1/5/JBOD Onboard Realtek ALC888 HD Audio Onboard Realtek® RTL8211BL LAN