It might be more relevent to ask this question when FCP X is released in June – FCP7 makes little use of multiple cores or GPUs. You’ll see some speed increase going from 2.0 to 2.2 clock speeds. The GPU will probably make little difference. However, I’d be tempted to say this might all change soon…
Whilst using FCP7, look for processors that support turbo boost, as the extra clock speed available to cores for rendering makes a difference.
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