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It seems like this question has been asked a million times, but after a few hours of reading similar questions, I have not been able to find a clear answer.

I have a mid-2012 Macbook Air running OS X 10.9. I want to run dual 24" 1920x1200 monitors and the built-in 11" screen.

Can I use a thunderbolt RAID device (i.e. Promise Pegasus R4 or anything else with two thunderbolt ports out) to drive two monitors?

Will this work:

MBA -> RAID -> 2x miniDP to DVI adaptors -> 2x 24" screens

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No, not with the Promise Pegasus R4 has only two Thunderbolt ports. One you will need to connect to the MBA and then other to your miniDP adapter. You would need a Thunderbolt dock that has another Thunderbolt port or another video interface like HDMI, etc.

Something like this: http://www.caldigit.com/thunderboltstation/,etc

  • Wow. That makes so much sense! I assumed there was a third TB "in" port for some reason. – Jartron Jan 19 '14 at 18:28
  • Make sure you read the FAQ page for the CalDigit product (caldigit.com/thunderboltstation/faq.asp). It states "the Thunderbolt Station can support two monitors if one of them is an Apple Thunderbolt Display". It doesn't support two non Thunderbolt monitors. – Antony Perkov Apr 4 '14 at 11:38

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