I get like 15-20 fps in cherno too with my 5770, although I play on low and I even close windowsexplorer,set high priority,run game booster,and I also tried with Ramdisk. Nothing of all that really helped much,I still get terrible fps in cities.
I have the problem too. My specs : Amd Phenom x4 840 3.2GHz Radeon Hd5770 4 GB ram Windows 7 64-bit My CPU and GPU are both at only 30-40% but in cities I get drops to 15 fps,no matter on what settings or resolution.
I have the same problem,but my PC is actually better than yours. Amd Phenom x4 840 3.2GHz Radeon Hd 5770 4 GB Ram Windows 7 64-bit In cities I only get 15-20 fps,no matter on what resolution and settings. I play with 1280x800 and all settings to low/ultra low. Also I close the windows.explorer and set Dayz to high priority but that doesnt help either.