IF you're not playing on three monitors or 4k, a single 980 would be enough for maxing out every game with insane FPS, I'd then SLI in future sometime when pocket feels fuller. Also, G1 is an amazing card IMO, quiet, power (very!), cool and BIG (length). For SLI 970, 700W+ and for SLI 980, 750W (minimum) or 800W+ (recommended) from EVGA/ Antec/ XFX/ SeaSonic.