1000 G2 will work with GTX970 3-Way SLI.
3-way GTX970 is I think similar as GTX780Ti SLI eventually.
But if you change in future on some stronger graphics with higher power consumption and want to overclock together with Processor,
than SLI will be better.
Yeah that was my thought, that if 1000 was enough, i might as well go 1300 so i won't have to buy a new psu in 2 years when i'm going for SLI GTX980 ti's or something. The thing that is worrying me right now though is what order to buy my parts in, i bought a rampage IV black edition mobo and i'm gonna get an i7 4820k cpu and planning on putting it in a corsair 900d case using a corsair h100i for temporary cooling till i can afford a full water loop. but i can only afford to get either the RAM or the PSU, i currently have some ugly as hell a-data "pcb style" 8gb ram and an XFX TS 550 watt 80+ bronze power supply. So i'm not sure whether i should stick with the ugly RAM and get an EVGA supernova or corsair AX1200i psu first getting the ram later in a few months when i can afford it, or buy the 16gb corsair ram i want and stick with the 550 watt psu until i can afford a new psu.
Not sure if a 550w would be enough to power a gtx970, i7 4820k, the rampage black motherboard, and a total of 10 fans properly. It runs my I5 3570K, GTX970, H61 motherboard, 2 fans etc.. just fine but i'm not sure if it'll be enough for all that new stuff.