Comparison of Mobility Radeon HD 3850 and Mobility Radeon HD 3870 [S]ave
| Attribute |  Mobility Radeon HD 3870 × | Mobility Radeon HD 3850 × |
|---|---|---|
| GPU | ||
| Release year (year) | 2008 | 2008 |
| GPU brand | ATI | ATI |
| GPU name | M88 | M88 |
| Market | Laptop | Laptop |
| Clock speed (MHz) | 660 | 580 |
| Is dual GPU | - | - |
| Model | Mobility Radeon HD 3870 | Mobility Radeon HD 3850 |
| Memory | ||
| Memory (MB) | 512 | 512 |
| Memory bandwidth (GB/s) | 54.4 | 48 |
| Memory bus (bit) | 256 | 256 |
| Memory type | GDDR3 | GDDR3 |
| Memory clock speed (MHz) | 850 | 750 |
| Effective memory clock speed (MHz) | 1,700 | 1,500 |
| Noise and power | ||
| TDP (W) | 55 | 35 |
| Load power consumption (W) | 253 | - |
| Idle power consumption (W) | 115 | - |
| Load noise level (dB) | 42.3 | - |
| Idle noise level (dB) | 39.9 | - |
| Raw performance | ||
| Pixel rate (GPixel/s) | 10.56 | 9.28 |
| Render output processors | 16 | 16 |
| Texture mapping units | 16 | 16 |
| Shading units | 320 | 320 |
| Floating-point performance (GFLOPS) | 422 | 371 |
| Compute units | 4 | 4 |
| Texture rate (GTexel/s) | 10.56 | 9.28 |
| Benchmarks | ||
| PassMark | 728 | 365 |
| 3DMark Vantage (Texture Fill) | 12.69 | - |
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