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I just bought a Mac Pro 2010 with an ATI5770 that has 2 x Mini Display Port (DP) and 1 x DVI.

The current configuration is as follows:

  • Mini DP A > passive HDMI adapter > 1920 LCD
  • Mini DP B > passive HDMI adapter > 1920 LCD
  • DVI > passive DVI to HDMI adapter > 1920 LCD

In this configuration, only two out of the three monitors will work at any given time. From reading up on the topic, I understand that I'll need at least one active adapter in order to get all three monitors going together.

What is the minimal number of active adapters I need? i.e. do I need one or two, and on which port(s)? If that matters.

A recommendation for suitable non-Apple adapters would also be appreciated.

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    Does this answer your question – How to get 3 1900x1200 monitors working on a 2010 Mac Pro ? – Graham Miln Jun 17 '15 at 12:41
  • I read that before, but I had to read it again to really follow. So I need 2 x Active Mini DP to HDMI adapters? – Black Jun 17 '15 at 12:55
  • I only have two displays connected to my Mac Pro. Hopefully someone with three displays will be along soon to provide an definite answer; otherwise a trip to an Apple Store Genius might be wise. – Graham Miln Jun 17 '15 at 13:11
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    well I just ordered 2 x active Mini DP adapters - so I can let you know on Friday ;) – Black Jun 17 '15 at 13:41
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    Please do formally answer and close this question when you know. I hope they work! – Graham Miln Jun 17 '15 at 13:46
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Confirmed: for this to work you need two (not just one) active adapters on the Mini DisplayPorts. When shopping around, the adapters may also be referred to as Eyefinity compatible. You don't have to buy genuine adapters - I am using two of the cheaper ones.

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