Even with the fastest AGP cards you are likely not to get the speed you
seem to need. 2560x1600 is a heck of a lot of pixels!

Current ~$200 PCIe 2x16 retail cards with DDR5 memory and 4x core CPUs
have fun with that high a resolution and fast response time!

I suppose it will depend a great deal on the rendering complexity.

On 9/5/2010 10:43 PM, Orson Cart wrote:
I have been given several workstations that are a few
years old. They are still quite useful (heaps of RAM, RAID SATA,
low-noise power supplies etc.) but have Radeon 9800XT AGP cards.
I have a scientific application in mind for them that requires fast
rendering on large screens (2560x1600).
What would be ATI's best of the AGP line?
In 2003 the 9800XT was a top of the line card initially? priced at
almost $500.

To the best of my knowledge
ATI Radeon™ HD 3450 (AGP) (Supposedly crossfire capable)
ATI Radeon™ X1650 PRO (AGP 8x)