Half-Life 2: Episode Two
We used a custom-recorded timedemo for this game, as well. We tested Episode Two with the in-game image quality options cranked, with 4X AA and 16 anisotropic filtering. HDR lighting and motion blur were both enabled.

In Episode Two, the Radeon HD 4850 maintains its lead over the GeForce 9800 GTX. Note the huge jump in performance over AMD's last mid-range offering, the Radeon HD 3870.