Benchmarks: Battlefield 4, Crysis 3
A standard R9 280X averages 45.7fps in Battlefield 4 while the GTX 770 is good for 44fps. The MSI R9 280X Gaming 6GB was just a tad faster than a standard R9 280X with 46fps, the HIS R9 280X iPower IceQ X² Turbo averaged 47.7fps while Sapphire's Vapor-X Tri-X OC R9 280X, Asus' R9 280X DirectCU II TOP and Gigabyte's R9 280X WindForce 3X OC all averaged 48fps, just 5fps slower than the GeForce GTX 780.
When testing Crysis 3 at 1920x1200 we see that the standard R9 280X averaged 36fps, while the GTX 770 was faster with 43fps. Unfortunately, the factory overclocked 280X cards couldn't match the GTX 770. The MSI R9 280X Gaming, HIS R9 280X iPower IceQ X² Turbo and Sapphire Vapor-X Tri-X OC R9 280X all averaged 38fps, while the Asus R9 280X DirectCU II TOP and Gigabyte R9 280X WindForce 3X OC were slightly faster with 39 to 40fps.