Benchmarks: Deus Ex Human Revolution, Dirt 3
The Radeon HD 7870 averaged 45fps in Deus Ex Human at 2560x1600 making it just 2% slower than the GeForce GTX 580 and 15% faster than the GTX 570. Additionally it was also 5% faster than the Radeon HD 6970. The Radeon HD 7850 on the other hand matched the GeForce GTX 570, while it was 3% faster than the Radeon HD 6950.
The Radeon HD 7870 was able to average 46fps at 2560x1600 in the Dirt 3 benchmark, making it just 8% slower than the Radeon HD 7950 and GeForce GTX 580. Meanwhile it was 10% faster than the Radeon HD 6970 and 18% faster than the GeForce GTX 570. The Radeon HD 7850 was 8% slower than the GeForce GTX 570, but 3% faster than the GTX 560 Ti.