A quad core is *usually a faster processor, so better. Look up a benchmark site to compare processing power, I have been pretty happy with my results with that. Keep in mind that the video card is going to be very important as well.
a core 2 duo e8400 for example is enough to run minecraft, but you will need an add on video card if you want good frames per second. I suggest a desktop so you can add in a video card easier.
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