Trees Strobing and then display driver crashes

[RiggsUK 69]

Im running AMD Phenom II x965 processor 3.42ghz

ECS MCP61M-M3 motherboard

4gb DDR3 ram

XFX ATI HD Radeon 4890 black edition 1gb DDR5 ram

Win 7

catalyst 12.10 driver with app profiles

So after 5mins to an hour of playing dayz the trees and grass start strobing white. I get a bit of screen tearing during the strobing and then the game freezes for about 10secs, the screen garbles for a sec and then minimizes to desktop or the screen just goes black. Were i can still hear and control the game yet it wont alt-tab back on. Sometimes saying "the display driver has stopped working and has recovered"

I can Shift - FLUSH the game back on yet it usually crashes 10secs later or maybe not for another 30mins-hour. I can look at the sea all day but as soon as i go near trees it can start again, Ive tried every combo of settings on the game, the AMD control center and different drivers. Only thing i notice is when Anti-aliasing is off in the game settings, it looks like a snow storm. All other games work perfectly, black mesa, warcraft. Also i ran Speedfan and its saying GPU temp goes between 54-94c when playing Dayz which ppl say is normal. Please help.

[RiggsUK 69]

I've fixed the above issue (Graphic card was overheating due to me not removing the flap on the case for the fan outtake during installation) and DayZ runs like a beast on full settings. Booyah