asus gtx 650 vs power color hd 7770

hi im currently confused with these two video card


ASUS GTX 650:
http://ph.asus.com/Graphics_Cards/NVIDIA_Series/GTX650DCT1GD5/#specifications

POWERCOLOR HD 7770
http://www.powercolor.com/Global/products_features.asp?id=392#Specification

i have into a lot of forums and they always say that hd7770 is much faster than gtx 650. but i want to know which is which between this two cards and i have also seen benchmarks and i am not convinced that powercolor hd 7770 is faster than asus gtx 650. enlighten me
confusedconfusedconfusedconfused