for now, i am on my laptop only and i have an
i 7 3610 QM at 2.3GHz
8 Gb DDR3 ram with an intel HD graphics 4000...(?)

but has a geforce gt650m
because actually, in the dx diag it gives me only that although it has a ge force gt 650m ?
EDIT : Checking google, support if there is like a kind of switch)
EDIT : in control, panel , devices , found teh nvidia control panel, which has a thing to select on of the 2 cards or leave it to autodetect, figured i also have to update some drivers too
but at home i ll put it to my home computer which is way better in overall
at least there i can run arma very decently , with high settings at full HD, despite some choppy moments ( way less, before OA, actually OA performance wise made the game much better on my system)
On the good side, halfway into the download of the alpha! and at the start, the store and the whole arma forums were so laggy because of the influx of users