Mac Pro and multiple monitors

I have a new Mac Pro (Late 2013) even though I bought it new in 2015. I have three monitors I'm trying to run on it.
2 are older Apple Cinema HD Displays.
Display Type: LCD
Resolution: 1680 x 1050
Pixel Depth: 32-Bit Color (ARGB8888)
1 is a Wacom 21UX which is my main monitor
Resolution: 1600 x 1200 @ 60 Hz
Pixel Depth: 32-Bit Color (ARGB8888)
All three hook up via Mini DisplayPort to DVI adapter ($30 a pop). I was under the impression that you could run up to 6 displays off this thing. This was one of the main reasons I upgraded and spent 4 grand on my Mac Pro. I've read in some other posts about Legacy stuff that the newer OS does not support this. I've also seen some post that talk about Active DVI adapters. I'm not sure what direction to go. It surprises me that this computer can't support multiple lesser monitors but will tackle 6 4K displays? Seems idiotic to expect an end user to only but that display at a grand each. There has to be a solution rather than going back operating systems to fix what will more than likely fail again. Thank gawd my brother gave me these monitors.
What Happens:
Only two will work at one time.

Hi,
This can't be true, I'm running 10.10.3 on a Mac Pro 3,1 (early 2008). This has 2 NVIDIA GeForce 8800 GT card installed in it with two monitors attached to each (4 in total).
I originally had 3 monitors each running at 1920 x 1200 @ 60 Hertz (NTSC), this worked fine. Today however I added a 4th monitor. The 3 original monitors are all Samsung 24A450's, the new one is an updated version of the same monitor - Samsung 24C450. When the monitor arrived, I shut down the Mac Pro, then attached the monitor and powered up again. When it started up, only two monitors were showing. After trying a couple of things, I shut down again and disconnected the new monitor and power up again, all 3 of the originals came back  up. I then tried connecting the 4th Monitor (the 24C450) while the machine was still running and low and behold it recognised it! I configured it and  it seems to work ok.
I have one remaining (minor) problem with it, the 3 original Monitors have resolutions of 1920 x 1200, but the newer monitor won't go above 1920 x 1080. Why is this? Is it possible to get this new monitor to match the 1920 x 1200 resolutions? If I got an active adaptor would this make it use the higher resolution. I'm connected via DVI on all four, is it a cabling issue? I am using the cable that came with the 4th monitor, but have another one on order which I'll try when it arrives.
So, unless you've solved the problem using active adaptors, you could try connecting the DVI to the machine while it is still running.
All the Best
Dave

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