XFX PVT84JUSD4 GeForce 8600GT XXX Zalman Edition 256MB GDDR3 PCI Express x16 SLI Ready Video Card (Dual DVI /S-Video) PCI-Express SLI-ready video card with 256 MB of 128-bit DDR3 memory Full support for Microsoft DirectX 10.0 Shader Model 4.0 PCI Express and Open GL 2.0 support NVIDIA SLI Technology allows two graphics cards to run simultaneously Dual Link DVI for high resolution monitors (up to 2560x1600)