How do I get 4 monitors on Mac Pro?

I've got a MacPro with the following specs:
Model Name: Mac Pro
Model Identifier: MacPro4,1
Processor Name: Quad-Core Intel Xeon
Processor Speed: 3.32 GHz
Number Of Processors: 1
Total Number Of Cores: 4
L2 Cache (per core): 256 KB
L3 Cache: 8 MB
Memory: 8 GB
Boot ROM Version: MP41.0081.B07
SMC Version (system): 1.39f5
SMC Version (processor tray): 1.39f5
Right now there are two Apple displays connected (Cinema HD 1920x1200), each one plugged into the wide connector on one of the two video cards in the machine. The cards are the NVIDIA GeForce GT120, GPU, in Slot-1 and Slot 2. The smaller (display connector?) plug on each card is empty.
I'd like to add two more monitors (like Dell 1680x1250 LCDs). Can I do this right now, with additional cards, or never? What do I need to do to get 2 more added? Can they be placed (virtually, in Monitor Arrangement) two on top of two others?
Mike

Grant Bennet-Alder wrote:
Some users have reported that the use of the MiniDisplayport adapter requires excessive force to seat properly, as there are a lot of contacts, and the adapter feels 'snug" way before it is making a good connection. Apple more force. Insert and remove several times until you are confident that is completely seated.
I'm pretty sure I shoved it in as far as it will go... I tried something else: I attached this monitor to the regular connector on that same card (the wide one with pins) and that worked fine, so I know it's not the monitor. I then attached the Apple monitor's port to the MiniDisplayport adapter and that didn't turn on either, so I'm pretty sure it's the adapter, or the cards (both?), or perhaps the cable - does that matter?

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