I have a problem that is happening in crysis 2 and 3. Hope someone can help!

When running crysis 2 in dx11 mode I get objects that pass behind the gun model or player arms disappearing and reappearing a fraction late. It happens on objects such as barrels and also parts of the background. It is exactly the same issue this guy has:

http://secure.gamesas.com/forums/viewtopic.php?f=40&t=36618&p=623226#p623226

Also his included video

http://www.youtube.com/watch?v=WPQLGkJQ9lM&feature=youtu.be&hd=1

I get no issues in dx 9 mode and game runs perfectly.

Thinking this would be limited to crysis 2 I went ahead and purchased Crysis3 only to suffer from the exact same problem. I don't have a video of it In Crysis 3 but its easy to spot if you load up the "welcome to the jungle level" and just before you set off to avoid the tower right at the beginning. If you wave your weapon over the background or melee, The player model will cause portions of the backgrounds to disappear and reappear a fraction late.

Im running win8 but the other guy who is having problems is running win7 so it 's not os specific. I have tried all manner of settings and cvars in crysis2 and still the issue persists. I have no issues in any other dx11 game. Any help would be massively gratefull.