How many 970's are you running? If it's two, I wouldn't recommend it, your usable video memory will be too low for proper 4k. I find 1440p would be better for you, I went that route and do not regret it one bit, it's a lot better than 1080p but not nearly as taxing as 4k.
There really isn't any proper, practical setup that handles 4k very well yet; the vram pool issue is the biggest culprit (you can't technically use more vram than is present in one GPU even if you have two or more, so three cards with 3GB will yield only 3GB of usable vram and not 9GB).







