| HD 6790 | HD 6850 | HD 6870 | |
| GPU | Barts LE | Barts Pro | Barts XT |
| Node | 40nm | 40nm | 40nm |
| Die size | 255 mm2 | 255 mm2 | 255 mm2 |
| Transistors | 1.7 Billion | 1.7 Billion | 1.7 Billion |
| SM units | 10 | 12 | 14 |
| Stream processors | 800 | 960 | 1120 |
| GPU frequency | 840 MHz | 775 MHz | 900 MHz |
| Performance | 1.34 TFLOPs | 1.5 TFLOPs | 2.0 TFLOPs |
| Texture units | 40 | 48 | 56 |
| Texture fillrate | 33.6 Gtexel/s | 37.2 Gtexel/s | 50.4 Gtexel/s |
| ROPs | 32 | 32 | 32 |
| Memory type | GDDR5 | GDDR5 | GDDR5 |
| Memory buffer | 1GB | 1GB | 1GB |
| Memory frequency | 1050 MHz (4200MHz) | 1000 MHz (4000MHz) | 1050 MHz (4200MHz) |
| Bus width | 256-bit | 256-bit | 256-bit |
| Bandwidth | 134.4 GB/s | 128 GB/s | 134.4 GB/s |
| Power connectors | 2 x 6-pin | 1 x 6-pin | 2 x 6-pin |
| Power consumption | 19/150W | 19/129W | 19/151W |
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