Need advice for graphics card for a 6 monitor setup (trading, gaming, cad, editing)

[heebyjeebeez]

I need to find a graphics card/ graphics cards for m new setup. I have 6 dell monitors with both DVI and VGA inputs. I can add as many cards as I need as long as it fits in my budget ($300) and I would be interested in buying used if I have to. The main thing is that I have to edit on them. 

 

Main questions:

 

Would it be possible to buy an amd eyefinity 6 or firepro 600 card (6 outputs each) for the outputs and have another card (nvidia/amd) to just process graphics/ render?

 

Could I even mix amd and Nvidia

 

I would only be doing light gaming (mostly minecraft, but i may go to more intense games in the future) and I do a lot of autodesk inventor, and after effects.  I also will be day trading stocks

[Sauron]

If you use one card for output, that's the card that must be used for rendering games. You can mix nvidia and amd, but they won't work together. If you do minecraft and inventor a single firepro should be just fine.

[bry.yyyy]

The only gpu i know with eyefinity 6 and under 300$ is HD 6950 it's pretty old gpu with PCI-E 2.1 256Bit and 2 GB DDR5

 

http://www.newegg.com/Product/Product.aspx?Item=N82E16814121431

[hansi358]

What is the resolution of these monitors?