Modern Warfare 2
With Modern Warfare 2, we used FRAPS to record frame rates over the course of a 60-second gameplay session. We conducted this gameplay session five times on each CPU and have reported the median score from each processor. We've also graphed the frame rates from a single, representative session for each. We tested this game at a relatively low 1024x768 resolution, with no AA, but otherwise using the highest in-game visual quality settings.

Practically speaking, any of these processors—except the Pentium 4 670—will serve just fine for Modern Warfare 2. Once more, the frame rate gap between the Core i3 and Athlon II X4 processors is negligible.

When minimum frame rates don't drop below 50 FPS, you're pretty much golden. If you have a Pentium 4 still, you're kinda not.