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[* black] Before we hit Retina, we scrape out a ''fan''cy fan. These blades are supposedly super quiet due to their asymmetrically spaced blades.
[* icon_reminder] Interestingly enough, while Jony Ive was jazzed about "thinner, variably spaced fan blades," [http://appleinsider.com/articles/12/12/20/patent-filings-detail-retina-macbook-pros-quiet-asymmetric-fans|this tech|new_window=true] has been included in certain MacBook Pro models [guide|9462|since 2012|stepid=36201].
[* black] There's also a significant amount of space not taken up by blades—that's probably another sick thermal system feature. Plus it looks nice in the video.
+[* icon_note] Likely a Texas Instruments motor controller on the fan flex cable