Comparison of Radeon HD 4770 and Mobility Radeon HD 4870 [S]ave
| Attribute |  Radeon HD 4770 × |  Mobility Radeon HD 4870 × |
|---|---|---|
| GPU | ||
| Release year (year) | 2009 | 2009 |
| Reference card | - | ATi Mobility Radeon HD 4870 550 MHz 512 MB |
| GPU brand | ATI | ATI |
| GPU name | RV740 | M98 |
| Market | Desktop | Laptop |
| Clock speed (MHz) | 750 | 550 |
| Is dual GPU | - | - |
| Model | Radeon HD 4770 | Mobility Radeon HD 4870 |
| Memory | ||
| Memory (MB) | 512 | 1,024 |
| Memory bandwidth (GB/s) | 51.2 | 89.6 |
| Memory bus (bit) | 128 | 256 |
| Memory type | GDDR5 | GDDR5 |
| Memory clock speed (MHz) | 800 | 700 |
| Effective memory clock speed (MHz) | 3,200 | 2,800 |
| Noise and power | ||
| TDP (W) | 80 | - |
| Raw performance | ||
| Pixel rate (GPixel/s) | 12 | 8.8 |
| Render output processors | 16 | 16 |
| Texture mapping units | 32 | 40 |
| Shading units | 640 | 800 |
| Floating-point performance (GFLOPS) | 960 | 880 |
| Compute units | 8 | 10 |
| Texture rate (GTexel/s) | 24 | 22 |
| Benchmarks | ||
| PassMark | 1,044 | 702 |
| Cloud Gate Factor | 12.11 | 11.67 |
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