Hey Ryan,
8800 Does quite well. I going to pick up a brand new MAC. There is a store right down the street from a client, they can walk right out of the store with a stock configuration that had the 8800 in it.
Also, if you look at Drew's results, from the following thread:
http://chaldee1.gotadsl.co.uk/~richa...ead.php?t=1362
On the new machine, I'll have stick in a Decklink Pro HD PCIe and a 64Gb Mtron. I had another machine up and running for the client doing a center screen with three edge blended projectors on a TH2G and two IMAG side screens running parallel of the second output.
I performed the demo using a Catalyst Pro licence but reduced the final machine to a DV since the client will never have a need for more than 8 layers.
Using the MAC Pro 2nd gen with the 8800, I am able to run 3 layers of custom content rendered 2816x768 AIC while simultaneously running 3 layers DVNTSC. No hiccups, no skips. Oh and there is less than a 2 frame delay on the capture card fed SDI from the client's switcher.