Sorry for my late reply,
I am currently experiencing a lot of internet connection problems so I haven't yet been able to upload the files. I will upload them as soon as my connection is repaired/restored.

Latest update seems to have fixed my problems again so I will try to send you guys my latest 2-3 crashdumps.

Regards enforcer

Correction to graphics card.
It is a Geforce GTS 240 (SLI enabled and PhysX acceleration enabled)

NEW INFO
Problem looks like it was fixed a couple of updates ago (3 I believe dev version) but it returned with the DEV build that was pushed today via steam.
Only difference is that I have a lot of stuttering before the crash and that I can play 5 times as long before the crash.

I just saw that my original DX11 error was already posted.
http://feedback.arma3.com/view.php?id=3846
This is the error I mention I already had before (and dissapeared).

http://rapidshare.com/files/746406285/Arma%203%20Alpha.rar
New link. I think I fixed it now but not sure because I never worked with rapidshare before.

edit: yeah just checked and it is fixed.
Files included are my last 2 games and 1 game with the previous DX11 error.