6 monitors on a Mac Pro 4,1 > 5,1

if you moved up the the usb card to slot 4 and the tempo to slot 3 you could add something like the 5770 in slot 2 assuming that the 5870 is a 2 slot card in slot 1 and power both with the 6 pin splitter cable. as for 1 single card to drive 6 screens with boot screens theres not going to be much. Im not sure theres a rom for something like the 7970 lighting and asus matrix cards that support 6 displays. and i don't think the sapphire 7950 mac edition allows the 6 displays 2-dvi, 1-hdmi, and 3 with a display-port hub like the new 280x and 290x do. The 680 pc and mac edition definitely does not support 6 displays as well as 780 or titan with an efi rom. the nvidia 600-700 series cards only support 4 displays.

The 7870 eyefinity 6 has 6 mDP ports and only requires 2x6 pin power, but you will not have boot screens. No card out there exists to support 6 with boot screens.

brand said:

It doesn't have a be driven by a single video card. Additionally I am open to replacing the 5780 with two cards that would provide the necessary functionality.

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How are you going to power 2 decent cards, you also need to run extra power, too

brand said:

I don't game so the cards do not have to be super powerful. Really I just want the best cards that would power 6 monitors.

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You can use 2 Radeon 5770. The 5770 only need one 6+Pin (so you can use two) and every card supports 3 monitors.

BUT: With 2 GPUs you have only room for 3 PCIe cards in your Mac Pro.

TzunamiOSX said:

You can use 2 Radeon 5770. The 5770 only need one 6+Pin (so you can use two) and every card supports 3 monitors.

BUT: With 2 GPUs you have only room for 3 PCIe cards in your Mac Pro.

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Correction, 2.

Lucas Godfrey said:

Correction, 2.

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2. is wrong because the 5770 has a double high profile and a second 5770 is blocking PCIe-Slot 3

Here is a picture form the MacRumors User Spacedust
http://imagizer.imageshack.us/a/img36/149/cfxk.jpg

Next problem is that the 5870 need two 6-Pin cables.

If you need USB and PCI SSD you can use a low profile GPU, but the most low profile GPUs dont have enought monitor connectors.

i see two options: eyefinity if works or kick one PCIe card.

EDIT: about eyefinity
http://forum.netkas.org/index.php?topic=735.0

jenzjen said:

The 7870 eyefinity 6 has 6 mDP ports and only requires 2x6 pin power, but you will not have boot screens. No card out there exists to support 6 with boot screens.

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You could combine this and a GT120 (single slot, no need for power feed) for boot screen.

you are right,Really I just want the best cards that would power 6 monitors.