Comparison of GeForce 840M and NVIDIA Quadro K620 [S]ave
| Attribute |  NVIDIA Quadro K620 × |  GeForce 840M × |
|---|---|---|
| GPU | ||
| Release year (year) | 2014 | 2014 |
| GPU brand | Nvidia | Nvidia |
| GPU name | GM107 | GM108 |
| Market | - | Laptop |
| Clock speed (MHz) | 1,058 | 1,029 |
| Turbo clock speed (MHz) | 1,124 | 1,124 |
| Is dual GPU | - | - |
| Model | NVIDIA Quadro K620 | GeForce 840M |
| Memory | ||
| Memory (MB) | 2,048 | 1,024 |
| Memory bandwidth (GB/s) | 28.8 | 16 |
| Memory bus (bit) | 128 | 64 |
| Memory type | DDR3 | DDR3 |
| Memory clock speed (MHz) | 900 | 1,001 |
| Effective memory clock speed (MHz) | 1,800 | 2,002 |
| Noise and power | ||
| TDP (W) | 41 | 33 |
| Raw performance | ||
| Pixel rate (GPixel/s) | 16.93 | 8.23 |
| Render output processors | 16 | 8 |
| Texture mapping units | 16 | 16 |
| Shading units | 384 | 384 |
| Floating-point performance (GFLOPS) | 812 | 790 |
| Texture rate (GTexel/s) | 16.93 | 16.46 |
| Benchmarks | ||
| Metro: Last Light | 11 | - |
| Bioshock Infinite | 15 | - |
| Battlefield 4 | - | 11.2 |
| Face detection (mPixels/s) | 25.44 | 22.54 |
| T-Rex (GFXBench 3.0) | 3354.04 | 3359.62 |
| Manhattan (GFXBench 3.0) | 2515.31 | 1855.62 |
| Bitcoin mining (mHash/s) | 97.66 | 94.68 |
| Sky Diver Factor | - | 120.22 |
| Thief | 10 | 9.1 |
| Fire Strike Factor | - | 12.59 |
| Ocean surface simulation (frames/s) | 299.75 | - |
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