My understanding:
GTX 470 "25% OC" ~ GTX 480
5850 "20% OC" ~ 5870
Now since GTX 470 costs 22K and GTX 480 costs 29K and 5850 costs 16K and 5870 costs 23K its logical to assume that in performance 5850 OC < 5870 < GTX 470 OC < GTX 480
So GTX 470 costs less than a 5870 but performs better when overclocked. Now people will say what about a Oced 5870 well see the 5870 lightning reviews and you will notice that the extra mhz's dont effect the 5870's performance that much and the 5870's current speed is pretty much a sweet spot.
I have ordered a 5870 not because i wanted to but i had to since my SMPS can not handle the power req of a overclocked GTX 470. For people who have enough SMPS power the GTX 470 is a better choice.
GTX 470 "25% OC" ~ GTX 480
5850 "20% OC" ~ 5870
Now since GTX 470 costs 22K and GTX 480 costs 29K and 5850 costs 16K and 5870 costs 23K its logical to assume that in performance 5850 OC < 5870 < GTX 470 OC < GTX 480
So GTX 470 costs less than a 5870 but performs better when overclocked. Now people will say what about a Oced 5870 well see the 5870 lightning reviews and you will notice that the extra mhz's dont effect the 5870's performance that much and the 5870's current speed is pretty much a sweet spot.
I have ordered a 5870 not because i wanted to but i had to since my SMPS can not handle the power req of a overclocked GTX 470. For people who have enough SMPS power the GTX 470 is a better choice.