I was thinking about upgrading to the 6890k but with the price is a bit steep to me. And since I have an APU I would have to get a graphics card... I was thinking of getting a 280x because I'm not really worried about DX12 performance or slightly faster rendering of whatever.
If you know anything about electronics it would be a pretty easy replacement. But if you don't then I'm sure you might know someone who used to work at the radio shack down the road before it closed down that would probably replace it for you for like 5 or 10 dollars.
Try deleting the appdata for Day Z
Windows + R > appdata > find the day z folder and delete it
You will lose a couple options but nothing important really