is 750W enough for 470 Sli ?

[wildman]

thinking of mauybe getting a 470 Sli Setup, if i get a goo dbranded 750 Watt PSU like XFX or Antec would this provide enough power, other parts of the system would be a sata III 1TB HDD, bluray drive, 955BE oced to 3.8 / 4 (if i can get 4 stable ) 4gb ram and a few 120mm fans in a cm690 advanced case