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Gaming isn't good in Parallels. I would also suggest just using Boot Camp.
The maximum VRAM that you can use is 256MB. I'm not sure why Parallels won't allow anymore considering 512MB is what low end video cards come with.
I couldn't get Black Ops to work with Parallels. It runs flawlessly through Boot Camp though.
Battlefield Bad Company 2 was working fine until I updated to the 11992 build. Now it starts to launch, goes to the black screen that says...