MSI Radeon HD 4890 1 GB GDDR5 Video Card  R4890-T2D1G OC [Retail] 880MHz Core Clock Speed;3996MHz Memory Clock Speed;800 Stream Processors Dual-link DVI-I Output: 2; HDMI with 7.1 Surround Sound Output (HDCP Ready): 1 (optional, via DVI to HDMI adaptor) D-SUB Output: 2 (optional, via DVI to D-Sub adaptor); TV-Output: 1 (optional, via S-Video to Composite) ATI CrossFireX Supported; PCI Express 2.0 x16; 1 GB 256-bit GDDR5 Enhanced Anti-Aliasing & Anisotropic Filtering; TeraScale Graphics Engine