NVIDIA GeForce GTX280 GPU; PCI Express 2.0 (Backward compatible with PCI Express) Bus Type; 1GB (1024MB) GDDR3; 665MHz (vs. 602MHz standard) Core Clock; 1458MHz (vs. 1296MHz standard) Shader Clock; 2400MHz (vs. 2214MHz standard) Memory Data Rate; 240 Processor Cores; 4.0 Shader Model; 53.2 Billion/sec. Texture Fill Rate; 512-bit Memory Interface; 153.6GB/sec. Memory Bandwidth; Microsoft DirectX 10 and lower OpenGL 2.1 and lower for Microsoft Windows; 2 Dual-Link DVI-I HDTV +TV Out; Dual 400MHz RAMDACs;Dual-Link HDCP Capable; HDMI Capable; 2-Way NVIDIA SLI Support