NVIDIA GeForce GT 640 GDDR5 vs NVIDIA GeForce GT 645 Full Specs
384 Shaders 950MHz | 288 Shaders 776MHz |
1GB GDDR580GB/s | 1GB GDDR591.9GB/s |
·· 729.6 GFLOPS | ·· 894 GFLOPS |
Form Factor PCIe Card | Form Factor PCIe Card |
TDP 75W | TDP 140W |
GeForce GT 640 GDDR5729.6 GFLOPSFP32
GeForce GT 645894 GFLOPSFP32Clock Speed ·· | Clock Speed ·· |
Peak OPS 729.6 GFLOPSFP32 | Peak OPS 894 GFLOPSFP32 |
FP32 729.6 GFLOPS | FP32 894 GFLOPS |
FP64 30.4 GFLOPS | FP64 74.5 GFLOPS |
Pixel Rate 15.2 GPixel/s | Pixel Rate 37.3 GPixel/s |
Texture Rate 30.4 GTexel/s | Texture Rate 74.5 GTexel/s |
Shaders 384 Shaders | Shaders 288 Shaders |
TMUs 32 TMUs | TMUs 48 TMUs |
ROPs 16 ROPs | ROPs 24 ROPs |
SMs 2 SMs | SMs 6 SMs |
Boost Clock 950MHz | Boost Clock 776MHz |
Shader Clock - | Shader Clock 1.55GHz |
L2 Cache 256KB shared | L2 Cache 512KB shared |
1GB GDDR5 | 1GB GDDR5 |
Memory Bus 128-bit | Memory Bus 192-bit |
Memory Speed 5GT/s | Memory Speed 3.8GT/s |
Memory Bandwidth 80GB/s | Memory Bandwidth 91.9GB/s |
TDP 75W | TDP 140W |
Multi-Monitor 2 | Multi-Monitor 2 |
1x HDMI 1.4 | - |
- | 1x Mini HDMI 1.3 |
1x DVI-I Dual-Link | 2x DVI-I Dual-Link |
1x VGA | - |
Encoder Model NVENC 1 | - |
Decoder Model NVDEC 1 | Decoder Model VP4 |
Form Factor PCIe Card | Form Factor PCIe Card |
PCIe 1.5-Slots | PCIe 2-Slots |
Height 111 mm (4.37")Width 145 mm (5.71")Depth 30 mm (1.18") | Height 111 mm (4.37")Width 210 mm (8.27")Depth 38 mm (1.5") |
Cooling Open-Air 1x Fan | Cooling Open-Air 1x Fan |
Manufacturer | Manufacturer |
Chip Designer | Chip Designer |
Architecture | Architecture |
Family | Family |
Branding  | Branding |
Codename NVE7 | Codename NVCE |
Market Segment Desktop | Market Segment Desktop |
Release Date Apr 24, 2012 | Release Date Apr 24, 2012 |
Foundry TSMC | Foundry TSMC |
Fabrication Node 28nm | Fabrication Node 40nm |
Die Size 118mm² | Die Size 332mm² |
Transistor Count 1.3 Billion | Transistor Count 1.9 Billion |
Transistor Density 10.76 MTr/mm² | Transistor Density 5.87 MTr/mm² |
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