Comparison of GeForce GTX 660M and GeForce 840A [S]ave
| Attribute |  GeForce GTX 660M × |  GeForce 840A × |
|---|---|---|
| GPU | ||
| Release year (year) | 2012 | 2014 |
| GPU brand | Nvidia | Nvidia |
| GPU name | GK107 | GM108 |
| Market | Laptop | Laptop |
| Clock speed (MHz) | 835 | 1,029 |
| Turbo clock speed (MHz) | 950 | 1,124 |
| Is dual GPU | - | - |
| Model | GeForce GTX 660M | GeForce 840A |
| Memory | ||
| Memory (MB) | 2,048 | 1,024 |
| Memory bandwidth (GB/s) | 64 | 16 |
| Memory bus (bit) | 128 | 64 |
| Memory type | GDDR5 | DDR3 |
| Memory clock speed (MHz) | 1,000 | 1,001 |
| Effective memory clock speed (MHz) | 4,000 | 2,002 |
| Noise and power | ||
| TDP (W) | 50 | 33 |
| Raw performance | ||
| Pixel rate (GPixel/s) | 6.68 | 8.23 |
| Render output processors | 16 | 8 |
| Texture mapping units | 32 | 16 |
| Shading units | 384 | 384 |
| Floating-point performance (GFLOPS) | 641 | 790 |
| Texture rate (GTexel/s) | 26.72 | 16.46 |
| Benchmarks | ||
| PassMark | - | 873 |
| Battlefield 4 | 35.45 | - |
| Face detection (mPixels/s) | 10.84 | - |
| T-Rex (GFXBench 3.0) | 3353.58 | 1707.37 |
| Manhattan (GFXBench 3.0) | 3709.34 | 3613.42 |
| Bitcoin mining (mHash/s) | 33.75 | - |
| Sky Diver Factor | 149.18 | - |
| Thief | 13 | - |
| Fire Strike Factor | 17 | - |
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