http://speedy.sh/WQsQ6/DayZ.rar
here are my data.
My problem were the items with flickering/white textures on it. when i threw them away and ran out of the area, frames came back to normal and everything worked fine

Was a Multi GPU problem for me.
Had the exact same problem as you guys. I just disabled Nvidia SLI (2 x GTX580
now everything works perfect fine again. hope this will let some of you guys play the game over the weekend :D

Edit: it didn't completely solve the problem. But its way better now, at least the game doesn't crash anymoreand and i can play up to 10 min without lags.

Makke112's tipp is a good one! I also had those flickering/white textures on some of my ''old'' items. but i didn't test it yet.

But I created a Hardcore Char with no gear (newspawn) and played it for 2 hours now without any issues.

hope this helped