1) Will a 650 watt PSU be enough? I currently have the following PSU: 650 Watt -- NZXT HALE82N-SI / 80+ Bronze
2) Will it fit in PC? I read that space is an issue. My tower is: Chimera Inferno 4SE Gaming Case - Flame, from ibuypower. Its a pretty big case, though not nearly the biggest I've seen. Definitely bigger than an everyday case though. I currently have the GTX 650, so I assume it would be around the same size. I have no idea though.
The card is 10.5 inches long, so reserve about 11 for breathing room.
3) How does SLI work, and would this card work in SLI with my current 650? Should I try hooking them together if I get it, or would it be a waste of time?
SLI only works with identical GPUs.
4) Finally, are there any deals on it anywhere? I see it on newegg for about 650, but thats without shipping and a warranty.
Do some shopping at other vendors, like TigerDirect, Fry's, Microcenter, etc.