Sapphire ATI Radeon HD 3870 512MB GDDR3 D-Sub DVI S-Video PCI-Express x16 Graphics Video Card 102-B33904-01-AT.ATI GPU Model Number: Radeon HD 3870Sapphire Part Number: 102-B33904-01-ATCompatible Part Numbers: ATI-102-B33904 102B3390401 109-B33931-00Specifications:Interface: PCI Express 2.0 x16GPU Model: ATI Radeon HD 3870 Memory Size: 512MBMemory Type: GDDR4Steam Processors: 320Memory Interface: 256-BitBase Clock: 775 MHz Memory Clock: 2250 MHzAPI:DirectX 10.1OpenGL 2.0Ports:2 DVI1 S-VideoCooler: Fan Heat Sink