Comparison of GeForce GT 640M Mac and GeForce GT 650M Mac [S]ave
| Attribute |  GeForce GT 650M Mac × |  GeForce GT 640M Mac × |
|---|---|---|
| GPU | ||
| Release year (year) | 2012 | 2013 |
| GPU brand | Nvidia | Nvidia |
| GPU name | GK107 | GK107 |
| Market | Laptop | Laptop |
| Clock speed (MHz) | 900 | 745 |
| Is dual GPU | - | - |
| Model | GeForce GT 650M Mac | GeForce GT 640M Mac |
| Memory | ||
| Memory (MB) | 512 | 512 |
| Memory bandwidth (GB/s) | 80.3 | 40 |
| Memory bus (bit) | 128 | 64 |
| Memory type | GDDR5 | GDDR5 |
| Memory clock speed (MHz) | 1,254 | 1,250 |
| Effective memory clock speed (MHz) | 5,016 | 5,000 |
| Noise and power | ||
| TDP (W) | 45 | 32 |
| Raw performance | ||
| Pixel rate (GPixel/s) | 7.2 | 5.96 |
| Render output processors | 16 | 8 |
| Texture mapping units | 32 | 32 |
| Shading units | 384 | 384 |
| Floating-point performance (GFLOPS) | 691 | 572 |
| Texture rate (GTexel/s) | 28.8 | 23.84 |
| Benchmarks | ||
| Particle simulation (mInteraction/s) | 87.07 | 69.88 |
| T-Rex (Compubench 1.5) (frames/s) | 0.81 | 0.56 |
| Video composition (frames/s) | 14.41 | 11.95 |
| Face detection (mPixels/s) | 8.63 | 6.58 |
| T-Rex (GFXBench 3.0) | 2726.54 | 3356.32 |
| Manhattan (GFXBench 3.0) | 1706.01 | 2290.86 |
| Bitcoin mining (mHash/s) | 13.28 | 12.55 |
| Ocean surface simulation (frames/s) | 342.74 | 226.22 |
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