Usually I get a second of stutter before the screen completely freezes, when I alt+tab, i see arma3 has stopped working, send/don't send error.
One time only, I got out of memory error, said something about expected 81xxxx kb (though not sure if i got it right)
When I crash once or twice, I verify game cache, it doesn't find anything, but next time I join the game, it doesn't crash, not sure if it has anything with me verifying, or just a coincidence.
CPU I5 3570k
GPU Radeon 6950
RAM 8gb 2133mhz
MOBO Asrock z77 extreme 6
Since I couldn't get files uploaded here for some reason, even though they were small enough in size, I uploaded everything here
https://mega.co.nz/#!5wECHZZA!E2C-U2f9kkNCNiXJF9Ab0UCn5aAT-QQYINlFGHGbgoo