When playing Crysis/FarCry2/S.T.A.L.K.E.R. with my GTX 260 cards I get a horrible graphical glitch. When moving if I'm looking at grass or the ground I see some sort of grid/matrix that almost appears to be under the ground. When I stop moving I just see the grass/foliage normally. It is the same with SLI enabled or disabled. Also, this occurs as soon as the game is started. My cards are not overclocked. They are using standard settings. Any idea of what could cause this? It is so bad that these games are almost unplayable.