I'm looking at building a system to handle large panos both flat and spherical 180s. How much benefit would I get for getting a fast graphics card? (I'm looking at a high performance video card that is used for rendering for Autocad, Photoshop etc. but it is expensive -- like $700.) There clearly isn't much use in having a card like this if it doens't make much difference.
GPU is only usefull for editing and even that can be done without. I would invest in fast CPU, lots of memory, PCI-SSD's etc. first. Buying a expensive GPU is only for upgrading a machine that can't be upgraded otherwise. And if you do, APP and APG only use single GPU, but it will the GB's on the card thankfully.