I don't know the answer to your question.
Where I see the real advantage to the newer cards is when software developers program features to take advantage of the considerable advantage GPU processing has over the CPU for processing graphics.
From what I understand, right now it is the nvidia cuda cores that are being used by develpers, but it appears that other techologies may be available in the future.
As far as the amount of Ram available on the card, the more the better if you are into rendering, which requires that the entire model be loaded into the cards memory. You can check out Octane Render's free version to see what this offers.
I believe the oldest card supported is the 8400. I have an 8500 myself and it has only 16 cuda cores, but it does work. I am currently waiting to check out the new GTX 560 which should be out in a few weeks, and there is supposed to be a 2Gig version for around $250.00 US.
I can't imagine that TC will not be taking advantage of these new capabilites in the future.
edit: The GTX 560 is not a fanless model, and TC V17 does support Redsdk for 2D graphics if the card is capable.
« Last Edit: January 20, 2011, 09:09:10 AM by Rod Cole »
TC V21 Pro Platinum Win 7 Professional