TressFX works fine. What people do not understand, is that it is a compute based physics feature. Basically meaning you need a GPU good at compute, which is what GCN architecture is very good at. 5870s, were junk with compute, and Nvidia Kepler, is the same way unless you have a Titan, or a Quadro/Tesla card. Kepler has had its double precision part of the GPU completely stripped from it for the GeForce series, which is why performance with TressFX isnt that great on Nvidia cards, or other cards that are weak in compute (5870s). I played and beat Tomb Raider with a gtx680, and once Nvidia was able to get drivers released that worked well with the final game code, the game ran like butter. I was getting 50-60 FPS constant maxed (it would drop below that, but not long enough for me to notice. And my eyes are pretty tuned to dropping frame rate too). I get even more now with the 780. Geforce cards handle TressFX through pretty much brute force, since their compute performance is lack luster.