This may be a drivers issue, though I had the issue on ARMA 2 before and with a bunch of fiddling, I was able to eventually get it to work (and I have not touched the settings since then, roughly two years ago), but I have not had any success in DayZ. I'm fairly certain this issue came after a DayZ update since I was still running the AMD 13.8/13.9 drivers at the time, and has not gone away with the 14.1 and 14.2 beta drivers. I'm running this on a FX-8150 with a HD7950 and 16GB of RAM, so as far as I know, this shouldn't be a hardware issue
How the screenshot looks http://i.imgur.com/9WBImOl.jpg
How the game looks for me http://i.imgur.com/yiVbq3x.jpg
Slightly better pic of how it looks for me http://i.imgur.com/4kj051K.jpg