Between the 13-inch and 15-inch Pro, what difference will the Quad make over the Dual Core processor?

I'm browsing through the MacBook Pros and just wondering if the Quad core will make alot of difference over the Dual Core?  Would there be any noticable performance differences?  Would the 0.2 (if that's the correct number) GHz make a difference in things such as garage band and streaming wireless video?

zodiak8900 wrote:
Would the 0.2 (if that's the correct number) GHz make a difference in things such as garage band and streaming wireless video?
A difference? Yes, but I doubt you'd be able to tell the difference moving back and forth between the two machines.

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