Same here.... First couple Minutes it runs Fine, but After walking some Minutes the Frames going Down and you leave it frustrating. Fresh installed win7, Intel Core to Quad , ATI hd6870 and all options on low with all tweaks i found about this Game. I can Easy Run bf3 with all maxed Out like all other games but dayz is stuttering and like deadmandan says, After some Minutes Running its getting Down with the Frames and Not coming back up.