in theory yes, however SLI on 970s are unstable right now at stock voltage and very unstable with even minor over clocking due to massive bug. I know, its what I roll and im about the put the 970s cards on ebay if I cannot get a refund. Sadly even setting manual voltages boost dosn't always work either and once you get a driver crash, a restart is needed to manually set the voltage again. Very annoying.
BTW each card is 100% stable with boost clock of 1400mhz and in SLI, so I know I have 2 good cards. The voltage dip is 0.1-0.12volts, this is more than you can boost in the software, so perfect stability is impossible.
Gone back to my 660ti SLI for now, while I consider which single 980 card to go far.
https://forums.geforce.com/default/topic/777448/-major-issue-sli-gtx-970-cards-one-card-runs-way-lower-voltage-than-the-other-driver-bug-/
sla70r :
Pretty much every single modern game works great with SLI and it matters huge what resolution is being played. Sli'd 970`s blow the 980 out of the water, and if you are playing 1440p or 4k you will need and want the extra firepower.
Here is a link to some benchmarks....
http://www.techpowerup.com/reviews/NVIDIA/GeForce_GTX_970_SLI/1.html