Diamond 4770PE5512 ATI Radeon HD 4770 512 MB 128-Bit GDDR5 PCI-Express Video Card 750 MHz core clock with 800 MHz memory clock Optimized for Windows Vista with comprehensive DirectX 10.1 support PCIE x 16 Interface Two Dual Link DVI with Composite, S-Video and HDTV out 128-bit GDDR5 memory interface