ZOTAC GeForce GT 640 1GB GDDR5 64-Bit PCI Express 3.0 HDMI DVI VGA Low Profile Graphics Card ZT-60208-10L 384 processor cores 64-bit memory bus Engine clock: 1046 MHz Memory clock: 5000 MHz PCI Express 3.0 (compatible with 1.1) DVI (Up to 2560 x 1600) HDMI 1.4a (w/audio (8-channel) VGA Triple simultaneous display capable HDCP compliant NVIDIA GeForce driver Microsoft DirectX 11.1 (feature level 11_0)OpenGL 4.3Microsoft Windows 7/8 x86/x64 ED 480pHD 720pHD 1080iFull HD 1080p NVIDIA Adaptive Vertical Sync technology NVIDIA Surround technology NVIDIA Unified Architecture NVIDIA PhysX & CUDA technology Hardware Video Decode Acceleration Blu-ray 3D ready HDMI xv YCC Color & Deep Color technologies Lossless audio bit stream capable 350-watt power supply recommended49-watt max power consumption