Just wondering if 2 GTX 680'S with 2gb VRAM will support 4k in the future?
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More aboutgtx 680 sli support
No, the max supported resolution on the 680 is 2560 x 1600.
Yes it will; but it is not optimal, i would suggest at least GTX 780 SLI. With GTX 680 SLI i remember seeing benchmarks on an article with Battlefield 3. It gave average of 30 fps on high settings and 22 on ultra. If you want to buy a 4k monitor; i would suggest GTX 780 sli or the new R9 290x cards (still need to see benchmarks for that tho)