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


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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