ASUS EAH4850 MT Republic of Gamers HD 4850 Review
 

Overclocking the ASUS EAH4850 was nice since the Catalyst Control Center was not as restricted as it is with some cards; it gave me a lot of room to play with. I started off with overclocking the GPU core 5MHz at a time, pushing it until I could no longer run stable. Once I maxed out the GPU speed, I started on the memory frequency, pushing it the same as I did for the GPU. I was able to get quite far on the ASUS EAH4850MT, farther than I expected. This card took everything I threw at it and begged for more. The final overclock was 730MHz on the GPU and 1098MHz on the memory. The other HD 4850 that was compared in this review topped out at 675/1075MHz, so the ASUS EAH4850 MT definitely has some juice to put out.

http://www.overclockersclub.com/reviews/eah4850mt/