Geforce 8400 Gs 512MB DDR2 XFX GeForce 8400GS 512MB DDR2 PCI Express Video Card General Features: NVIDIA GeForce 8400GS chipset 450 MHz Core Clock 1350 MHz Shader Clock 512 MB DDR2 memory 64-bit memory interface 800 MHz memory speed PCI Express x16 interface RAMDAC: 400 MHz NVIDIA Unified Architecture NVIDIA Giga Thread technology NVIDIA Lumenex Engine NVIDIA Quantum Effects physics processing technology