a single 970 I think would struggle at 4k, pixel count is a huge gpu resource eater. The 970M is also weaker than the 970.
Despite the hype 4k gaming is a niche thing, and its expensive.
A modern game like DA:I e.g. with its details turned up (but not max possible) stresses my 970 probably between about 50-90% range at 60fps, and I game at 1050p not even close to 4k.
Now granted at 4k you could probably turn MSAA off and not see the difference, which will save gpu cycles I think a single 970 would still struggle unless you turned down all the affects and then the visuals would be "disappointing".
There is a rumoured new titan card coming out tho, that may be ok without SLI but it will probably also be very expensive. The new amd 300 series cards I think the highest model will beat the current gtx 980.
I also wouldnt be surprised if a gtx 990 is released which will be 2 980s in one card.
note here, some are even saying 2 970s may not be enough.
http://www.reddit.com/r/buildapc/comments/2ol100/dis...
Edited by Chrysalis (Wed 11-Mar-15 13:14:18)