All those who think it's five percent you are looking at figures from May 2009-May 2010
This Here WHICH IS OUT OF DATE I guess must be what made you think that.
http://store.steampowered.com/hwsurvey
All this shows is DX11 adoption is very rapid and in Feb was already 20% projecting these figues to now gives you about 25% so we are looking at about 25% of the overall being DX11 and probably more like 35-45% of people who own or plan to buy Crysis 2.