Call of Duty 4: Modern Warfare
Overclocking is not very rewarding here, improving performance by 7% at best. This is not enough to compete with the Radeon HD 4850, let alone Radeon 4870 with its super-fast GDDR5 memory. On the other hand, you can play at any popular resolution, including 1920x1200, at the overclocked as well as default frequencies.
The overclocking gain is small in Crysis, too. However, the GeForce 9800 GTX+ cards feel better than the Radeon HD 4850, at least at low resolutions. At the high resolutions the overall level of performance is too low to play the game on these cards at the highest graphics quality settings.