Problems with flickering green screen CRYSIS

Well I get a flickering green screen in all the monitor as displayed in the linked pic weird thing is it only happens in crysis with all very high spec if I turn shaders to high it goes away also play crysis warhead on enthusiast no problem at all and all my other games works flawless I am thinking maybe the new nvidia video driver 326.41 did this since it was not like this b4 I have a OC gt 640 2gb .Core 1076 mhz mem 1005 mhz voltage bumped to 1.050 mw OC was tested exhaustively even with crysis 3 and kombustor for over an hour max temp is 64c and only when running crysis 3 can someone help me fix this plz

http://img200.imageshack.us/img200/9942/nft0.jpg

Have you tried removing the overclock and resetting to factory defaults to see if it helps?