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I am considering purchasing a new MacBook Air (early 2014 edition). I'd like to drive two external monitors from the laptop.

Based on my reading the 2013 Air only supported Thunderbolt 1 and therefore DisplayPort 1.1. With the semi-model-refresh that occurred in early 2014 was the Thunderbolt controller updated to version 2 and therefore DisplayPort 1.2?

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No, The Early 2014 MacBook Air has Thunderbolt 1 and therefore DisplayPort 1.1.

Source : Apple Support Page

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  • and regarding your intention to buy a MacBook : You should probably wait for the MacBook Pros to get TB2 first (buy them if you like) - and after that wait for the MacBook Airs to get TB2. – rwenz3l May 2 '14 at 9:20
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Mid-2012 and later MacBook Airs do support two Thunderbolt displays (see this document from Apple), but if you're not using Apple displays it's a bit more complicated.

You'll need to either invest in something like this Mini DisplayPort to dual HDMI adapter, a Matrox DualHead2Go or a DisplayLink USB adapter (those do have issues with newer Macs and Mavericks though, I believe).

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This french article says yes Thunderbolt 2 but :

  • Apple markets it as a TB2.
  • But the processor has only 6 PCIe lines :
    • 1 for the webcam
    • 1 for the wifi
    • 2 for the SSD

Leaving only 2 PCIe lines for the thunderbolt which is barely enough for the TB 1 specs (in terms of bandwidth).

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