if R680 have it +/- the same performance like Ultra, is comparable to GTS-512because difference between Ultra and GTS-512 is small ... GTS-512 is cheaper then this R680 ...

You can choose : R680 - brutal heat, performance like Ultra (oced GTS-512), noisy cooler for 600USD! Or GTS-512 with oced the same performance, great cooler for 400USD ... what is better?