Played fine for about an hour and a half, then randomly go an Out of Memory error and the game crashed (image attached).
The page file setting was first set to Auto. Then when i loaded DayZ up again, it crashed after running a few steps.
Loaded Dayz up again, checked the page file and it had defaulted to 1024mb. Joined a server and it crashed before the game rendered the environment. {F28464}