you might think so...
but let me e the first to tell you something.
psst, your wrong.
No he is not wrong, the GTX 570 draws around 216W almost double the power consumption of HD 7850 which is 110W.
The reference design card HD 7850 gets 61C when loaded, while the GTX 570 ref gets 78C while loaded.
So I might sacrifice 5% performance which I can fill by overclocking but I'll get over heat and power consumption