If you are not gaming what advantage would there be with a 5870 over a 5770 graphics card and all you do is video editing and photo editing?
http://www.barefeats.com/wst10g7.html
See those benchmarks and his insights in the bottom. It depends what apps do you use
I already have an Apple 24 ACD which will connect via mDP. I plan on getting 2 more mDP connecting monitors (cinema displays, 24in) that use mDP. I understand the third one will need a mDP->Dual DVI adaptor.
The work stations I will be monitoring will not have any type of graphics editing, or photos, or anything as intensive.
You won't notice a difference between the 5770 and 5870. If you find that the 5770 doesn't suit your needs for whatever reason, you can always get another one and link them together with Crossfire for maximum performance (better than a single 5870.)
@Hellhammer
Are you sure? 2x 5770 is an option on the 2010 Mac Pro
Got it. Looks like the 5770 is good to go.
And to confirm, when I connect the 3rd display, the Altona adapter for mDP->to dual DVI is recommended.
Thanks gents.
@Hellhammer
Are you sure? 2x 5770 is an option on the 2010 Mac Pro
Well, I wouldn't recommend it due to its price. As I said, get GT 120 from eBay and put it in one of the PCIe slots (it's single slot card so you would still have two slots free). It has one mDP port so you can use that for the third display and still have 2xDVI (one in each GPU) for additional displays if needed.
You can still have multiple GPUs without CFing or SLIing them. 2x5770 gives you more outputs and thus lets you connect more monitors. That's the idea of it.