Tested on Linux and ATi Radeon HD 5850. AMD APP SDK 2.7 in system with Catalyst 12.4 was installed manually. Cg Miner 2.4.1. Core Peak - 750 MHz, Memory Peak - 250 MHz.

Driver  SDK  Perfomance

12.1     2.6   301.9 Mh/s
12.4     2.7   298.5 Mh/s
11.11   2.5   307 Mh/s