Overclockers Club published a review on the Sapphire Vapor-X R9 280X TRI-X OC
A quote from the article:
The one other true difference comes to light when overclocking. We all know one sample is not indicative of the entire line, but we see how aggressive the binning is between the Vapor-X line and the Toxic line. This sample clocked to 1160MHz on the core clock and screamed up to 1700MHz on the 3GB of Hynix memory for added bandwidth. This certainly helped performance in the 3DMark testing. Depending on the game test, Sapphire's Vapor-X R9 280X TRI-X OC matched up best with the GTX 770, usually delivering higher FPS at 5760x1080. In every game the Vapor-X R9 280X TRI-X OC delivers smooth gameplay with high settings for a truly enjoyable gaming experience at 1080p resolutions.Sapphire Vapor-X R9 280X TRI-X OC Review @ OCC