Can my computer handle Dayz(mod of armaII) on max settings?
HD radeon 6850
8 gb ddr3 ram
Thank you for your time
Download Arma II Free and Run that, If that runs well then Yes, DayZ will work as It's a mod of Arma 2.
From what I see your Parts are good and DayZ is only really heavy on the CPU, not the Graphics. I know a lot of people who are using old 8600 GT cards that can run it.
To be 100% sure just download the Free version of the game (It's Legal, on Steam also) but I think it will run fine.