I tried playing both with the normal build and the dev build.
Also with high and low graphics settings.
included my last 3 .rpt files and BIDMP files.
http://rapidshare.com/files/746406285/Arma%203%20Alpha.rar
Had a DX11 memory issue before but that seems fixed with last update (or it happens after the game crash).
Task manager shows a huge increase in processor activity (30% I missed it but I think it also displayed over 80% I7 processor) and a enormous increase in RAM activity (4,8 GB's currently running 6GB's of RAM)
I believe my graphics card is a GTX240 but not sure will check if required.