Command and Conquer 3 Kane's Wrath is one of my favorite new games that has been released in the recent past. The Global Conquest mode and the Brotherhood of Nod campaign that ties much of the stories of Command and Conquer 2 and 3 together, make this game an excellent one. The game plays at the maximum framerate cap for the 9800GTX card.
Crysis played well on the 9800GTX with framerates in the low 20s at 1680x1050 resolution and 4x AA 16X AF enabled. While most people would consider this framerate unplayable on most first person shooter games I was able to play through the first hour with this setting without getting killed by enemies because of the graphics card rendering the graphics too slow to react in time. Call of Duty 4 is the included game in the bundle that comes with this card. This game was almost completely playable on the 9800GTX with 1920x1200 resolution and 4x AA 16X AF enabled there was only slowdowns in a really heavy firefight. Otherwise those settings were comfortable and looked great on the XFX 9800GTX.