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Graphics card version | GT 640 128-bit DDR3 |
GT 640 192-bit DDR3 |
GT 640 128-bitGDDR5 |
CUDA Cores | 384 | 144 | 384 |
Graphics Clock (MHz) | 797 | 720 | 950 |
Processor Clock (MHz) | 797 | 1440 | 950 |
Texture Fill Rate (billion/sec) | 25.5 | 17 | 30.4 |
Memory Clock (MHz) | 891 | 891 | 2500 |
Standard Memory Config | 1 or 2GB DDR3 | 1.5 or 3GB DDR3 | 1 or 2GB GDDR5 |
Memory Interface Width | 128-bit | 192-bit | 128-bit |
Memory Bandwidth (GB/sec) | 28.5 | 43 | 80 |
OpenGL | 4.2 | 4.2 | 4.2 |
Bus Support | PCI Express 3.0 | PCI Express 2.0 | PCI Express 3.0 |
Certified for Windows 7 | Yes | Yes | Yes |
Supported Technologies | DirectX 11, CUDA, PhysX, 3DVision | DirectX 11, CUDA, PhysX, SLI, 3DVision | DirectX 11, CUDA, PhysX, 3DVision |
Maximum Digital Resolution | 3840x2160 | 3840x2160 | 2560x1600 |
Maximum VGA Resolution | 2048x1536 | 2048x1536 | 2048x1536 |
HDCP | Yes | Yes | Yes |
HDMI | Yes | Yes | Yes |
Standard Display Connectors | VGA, HDMI, DVI-D | VGA, HDMI, DVI-I | VGA, HDMI, DP |
Audio Input for HDMI | Internal | Internal | Internal |
Length | 5.7 inches | 5.7 inches | 5.7 inches |
Height | 2.731 inches | 4.38 inches | 4.38 inches |
Width | Single slot | Single slot | Single slot |
Maximum GPU Temperature (in C) | 102 | 102 | 102 |
Maximum Graphics Card Power (W) | 50 | 75 | 75 |