So I'm going to be upgrading my setup. What would be best for 4K (Single monitor)?
R9 290X 8GB or wait for the 8 GB GTX970/980 to drop the extra vram is useful for 4k gaming.
R9 290X 8GB. It beats the new nvidia cards in 4k.
http://www.newegg.com/Product/Product.aspx?Item=N82E16814202129&cm_re=8gb_290x-_-14-202-129-_-Product
Whichever you choose, buy two.
just buy a 980 - a single 980 is fine for 4k - i know because i own two. One was plenty for 4k without AA. two lets you have all the eye candy.
Or buy 1 or 2 290x's