ATI has released its new Catalyst 7.8 drivers, you can grab them over here.
This release of Catalyst introduces an enhanced version of ATI Overdrive for the ATI Radeon HD 2600 Series and ATI Radeon HD 2400 Series. Users can now Over-clock both GPU engine and graphics memory clock speeds in Crossfire mode (and over-clock single ATI Radeon graphics accelerators as well). This version of ATI Overdrive also includes a new stress test application to verify any over-clocking speeds users may have configured (either manually or through the auto-tuning tool) on their ATI Radeon graphics accelerators.
Lost Planet DX10 with anti-aliasing improves 11% or greater on Radeon HD2900XT products
Radeon HD2600 and Radeon HD2400 (single and CrossFire) show improvements of as much as 6% in 3DMark 2006 and 3DMark 2005
Serious Sam 2 with HDR enabled improves as much as 14.5% on Radeon HD2900, Radeon HD2600 and Radeon HD2400 products