to run that game at 60 fps high settings you need a whole new machine. the game is badly written from the off and dayz doesnt do much to put the basic errors rite. the biggest performance hitter is the draw distance. if you have a 1 gig card you should be able to run at medium settings 1080p with a draw distance of 1000. any more than that and you will cripple the fps.
im not kidding when i say you would need a new system, i have seen this mod cripple a 3570/gtx680/16gigs of ram. on optimum settings it refuced the fps to just over 30 and there were a few things that could have still been turned up... so yeah its a system killer. but not because its gfx are good, but because of poor inital programming on the game engine.