I have an i7 2600k running stock speed and a Radeon 6970 struggling on the Dayz standalone with average settings. I bought a basic MSI 780 to use with my 2600k and then had no problems at all playing Dayz at full maxed out settings. This lasted 2 days before the 780 died and then failed to post so its been returned. A 780ti should have no problems and I can't wait to get one and get back into the same.
Not sure if it is card or manufacturer specific but my 780 had a feature built in to record perfect full-hd in-game video in the background with practically no noticeable affect during game play.
Dayz standalone and dayz mod is cpu intensive so which means it doesn't require a lot of gpu power. i changed my 680 to 780ti and i got same fps on dayz standalone and dayz mod so there is no point in upgrading your gpu to get more fps on dayz.
Without overclocking my 4770k i got around 30-65 fps on dayz standalone. I overclocked my 4770k 3.2ghz to 4.4 ghz and got 45-77 fps. Next i overclocked my 4770k 4.4ghz to 4.7ghz with my H100i and got 49-84fps on dayzstandalone. Upgrading my 680 to 780ti didn't change any fps at all so Dayz standalone is 100% cpu intensive game.