Yes, But that still consumes more power, and put out more heat than a single 5970, I recommend a 5970 as it beats the GTX 480 and it has a lower TDP etc.
460 is ok if your buying 1 card at a time if you already have a SLi board, But 5970 is better from the get-go.
EDIT: 5970 will also not need as much power as a 460 SLi SFAIK