Comparison of Mobility Radeon HD 4860 and Radeon HD 4855 [S]ave
| Attribute |  Mobility Radeon HD 4860 × |  Radeon HD 4855 × |
|---|---|---|
| GPU | ||
| Release year (year) | 2009 | 2010 |
| Reference card | - | ATi Radeon HD 4855 575 MHz 512 MB |
| GPU brand | ATI | ATI |
| GPU name | M97 | RV770 |
| Market | Laptop | Desktop |
| Clock speed (MHz) | 650 | 575 |
| Is dual GPU | - | - |
| Model | Mobility Radeon HD 4860 | Radeon HD 4855 |
| Memory | ||
| Memory (MB) | 1,024 | 512 |
| Memory bandwidth (GB/s) | 64 | 115.2 |
| Memory bus (bit) | 128 | 256 |
| Memory type | GDDR5 | GDDR5 |
| Memory clock speed (MHz) | 1,000 | 900 |
| Effective memory clock speed (MHz) | 4,000 | 3,600 |
| Noise and power | ||
| TDP (W) | - | 110 |
| Raw performance | ||
| Pixel rate (GPixel/s) | 10.4 | 9.2 |
| Render output processors | 16 | 16 |
| Texture mapping units | 32 | 32 |
| Shading units | 640 | 640 |
| Floating-point performance (GFLOPS) | 832 | 736 |
| Compute units | 8 | 8 |
| Texture rate (GTexel/s) | 20.8 | 18.4 |
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