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The fx will play them, but it will not be able to handle all games in the future without stuttering.
Perhaps one of these would suit you better? http://www.tomshardware.com/reviews/gaming-cpu-review-overclock,3106.html
No, the macbooks aren't magic, the laptop i7 is a lot better than the laptop i5 and for the vast percentage of situations a windows or Linux machine will have better suited software too. Unless you absolutely need that Apple specific software, there is no reason not to buy a windows machine, as...
You guys are forgetting that these are laptop cpus.
The i5 in question is actually a duo core with hyperthreading (basically an i3), while the i7 is a quad core with hyperthreading.
Together with the 400 mhz in core difference and double the amount of cache, I would much prefer the i7.