amd is always playing catchup with nvidia in general
amd is betting on a follower's strategy, but their market share is too small, the strategy's been a failure
regarding the feature, well we need some benchmarks so as to be able to judge its readiness for realtime graphics
It's only in recent years AMD has been playing catchup, AMD/ATI use to be ahead in features introduced compared to Nvidia. Also in most cases we are talking about features here that Nvidia created themselves and not the industry standards used like Direct X features, which AMD/ATI use to have before Nvidia in their GPUS in most cases.