From everything I have read, two 670's in SLI is roughly the speed of a GTX 980 card. Just wondering if anyone here on the forum has done this upgrade, and if so - what their thoughts are. Still kind of torn whether to go all out for a GTX 1080, or if the 1070 will provide enough of a boost to run newer games at 1440P. As I always go 3-4 years between upgrades, I want something that will be an upgrade, not a sidegrade. Anyone have any experiences to share?