Diamond 4890PE51GXOC ATI Radeon HD 4890 1024 MB XOC 256-Bit GDDR5 PCI-Express Video Card 925 MHz core clock with 1050 MHz memory clock Optimized for Windows Vista with comprehensive DirectX 10.1, 10.0 and DirectX 9 support PCIE x 16 Interface Two Dual Link DVI with HDTV out (HDMI support with adapter) 256-bit GDDR5 memory interface