If you don't want to read the long architecture changes etc on the Anandtech review skip to page 12(thats page 7 for Techreport if you really just want to see the charts).
4850 and 4870
http://www.anandtech.com/video/showdoc.aspx?i=3341&p=1
http://www.techreport.com/articles.x/14990
4870
http://www.guru3d.com/article/radeon-hd ... iew--asus/
4850
http://www.vr-zone.com/articles/RV770_D ... /5901.html
http://www.tomshardware.com/reviews/rad ... ,1957.html
http://www.guru3d.com/article/amd-ati-r ... owercolor/
