they bought two crucial 2.5" 512 ssds which added to the price of the asus
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sure apple computers cost more but this is not the fairest comparison:
1) they are comparing a thin laptop with a 650m 1gb against a thick laptop with a 670m 3gb, of course the 670m 3gb machine will win out in raw graphics performance
2) they used two crucial ssd's in raid 0 (500mb/s per drive) which is faster than the retina's current 500mbs ssd, but on wednesday the retina will get the pcie ssd that should perform somewhere between the 800mbs the air has and the 12500mb/s the mac pro will have... but comparing a minature ssd to dual 2.5" ssds is not fair,
where does size, weight, and portability come into value?
3) they ignore any value the 2880x1800 screen has to photographers, and they don't install windows on the rmbp and they dont set the resolution of the rmbp to 1920x1080 - sure "while the native resolution on each display differs, both machines are attempting playback at the actual video file resolution of 1920×1080" while that is true it does not account for the fact the rmbp's 650m is worrying about so many more pixels for ui and crap that it would not have to worry about if they set the resolutions equally to 1080p
4) they exaggerated the price on the retina, why upgrade from the 2.6ghz to the 2.7ghz for $250 if the asus only has a 2.4ghz, that just adds to the $4k price tag without helping in the graphics performance, which is mostly what they compare anyway
5) upgrading the retina ssd to 768 is the majority of the price increase which they did not need to do, they could have left it at 256gb and then compared the performance of the computers stating a $2360 (asus) vs $2199 (rmbp) and the difference in graphics would have been the same - then they could state the rmbp has less storage but is much thinner than the asus
look at the size, it's massive! of course you get more performance at a cheaper price when you can shove two 2.5" drives into it and a 670m without having to worry about heat..