We used our standard graphics card testing setup, consisting of an Intel Core i7 3960X (Sandy Bridge-E), 16 GB Corsair DDR3-1600 RAM, an ASUS P7X79 Pro motherboard, a Samsung Spinpoint F1 hard disk, a Cooler Master Silent Pro Gold 1200 watt power supply and Windows 7 x64.
The driver we used for the test was AMD Catalyst 13.11 beta 1. In the charts we included the R9 270X cards, R9 270 and GeForce GTX 760 cards.
You will see that among the R9 270X cards (red bars), the XFX is the fastest thanks to its clock frequencies. They're all close together in terms of performance, however.