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I'm not sure why he says the effective resolution is 1280x800. The resolution is 2560x1600. I just sold my 13" Air and bought a 13" rMBP; very happy with it so far.

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It's because the rMBP uses 2 pixels to display 1px which is why fonts and graphics appear sharper.

Actually it should be 4 pixels to display 1 "point".

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