Unable to connect more then 2 monitors for Mac Pro end of 2013

I was wondering if anyone had this problem and found a solution.

The Mac pro (end 2013) model that I have would not work with 3 or more screens, little matter what I do. Even if him are all connected to separate buses. Only 2 would work at any given time. When I cut the work one, one nonfunctional lights.

They are related:

Computer-> Thunderbolt to HDMI-> monitor

Computer-> Thunderbolt to HDMI-> monitor

Computer-> monitor-> HDMI/DVI

Setting up and connecting cable is not a problem here, because I tried a lot of different ways to connect with different types of monitors.

Just replaced a new video card and the problem still there.

am I missing, or hurt?

any idea is aprisiated!

Thank you!

OS X El Caplitan

10.11.6

2.7 GHz 12-Core Intel Xeon E5

64 GB 1866 MHz DDR3 ECC

AMD over-pants D700 6144 MB

Mac is unable to produce interfaces to more than two screens "legacy" levels of tension necessary to keep them from dropping out. You need an ACTIVE adapter for some of these screen to run more than two (including the interface HDMI built-in, that counts as if connect you something). poster "legacy" is other than DisplayPort and Mini DisplayPort

Adapters ASSETS have re-drivers of signal in them, that's why they are more expensive. As long as you stay under 1920 wide, you don't ask the very expensive adapter Apple DVI Dual-Link, $ 100.

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