AcceleratorX

Youngling
Based on charts in the below link I think the 7770 is catching up to the 6850 with newer drivers. Have a look:

iXBT Labs - i3DSpeed, April 2012 - Page 2: Performance charts

Though it's still on average 10% slower, each new driver brings it closer. For this reason I'd say a 7770 is a better bet now and may be better than the 6850 in the future.
 

topgear

Super Moderator
Staff member
look at the performance rating of HD6850 which even at stock speed can still beat an OCed HD 7770 with 1120/5200 clock speed and the performance of HD7770 improved by 0.5-1.5fps at best ( 1920*1200 resolution ) from 12.1 to 12.4 driver version in DX11 game titles.

iXBT Labs - i3DSpeed, February 2012 - Page 2: Performance charts
 
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