I'm about to use a Dell U2713h on a Palit GTX 970 reference(http://www.palit.biz/palit/vgapro.php?id=2406)
Only thing is missing is the 4 pin that the DVI-I has, Will it work and will I get 1440p?
Provided both the GPU and the monitor (and the cable) support HDMI 1.4, (not 1.3) then yes it supports higher resolutions. Displayport also supports higher resolutions.
That's my understanding, but wait for confirmation.
I do have BF4, but haven't played it on this new system yet. I'm on the road right now in Canada (brrr), but I'll load it up next week when I'm back home.