Anything less than the E-350 yields unsatisfactory performance. The single-core E-240 actually turns out to be the worst performer, despite having a faster clock speed than the C-50.
Even at lower resolutions, Call of Duty: Modern Warfare 2 is essentially unplayable. We benchmarked using medium settings, but this didn't result in scores greater than 20 FPS for HP's dm1z. Performance on the NV51B08u and the C655D is so poor that, no matter how low you set the quality, you duck in under 10 FPS.
Left 4 Dead 2 offers some relief for the under-powered 15.6" NV51B08u and C655D. When we dial everything down to 1024x768 using Medium quality settings, the dm1z and NV51B08u start to perform better, though the C655D scores pitifully when compared to the NV51B08u. Again, it's better to have a C-50 than an E-240.
We were unable to benchmark on anything higher than the Fair setting in World of Warcraft because the game requires a dual-core processor for higher presets. But if you use a netbook like the dm1z, you'll have few complaints. The quality isn't stunning, but lower settings are suitable for smaller screens, such as HP's dm1z.
On a 15.6" notebook, higher-detail settings make more sense, but they're unavailable to the single-core Zacate- and Ontario-powered notebooks like the C655D. However, even at lower settings, the E-240 turns out frame rates below 20 FPS. This is still about 30% less than the performance you'll get out of the E-350, which tells you something about how CPU-limited this game can be. Turning up the quality on Gateway's NV51B08u drastically lowers performance. Anything above 1024x768 and Fair quality is almost out of the question for those who want performance around 30 FPS.