What I want to know is what Mediator gfx card comes with the most contiguous RAM?
That would be one of the Radeon 9200s, but keep in mind there is not much point in this. Once you run out of Fast RAM on your Accelerator and your system starts using the Radeon RAM as general system RAM your whole system will come to a crawl. The 256MB Radeons are only good for the first 8MB or whatever you're going to use as Video RAM the rest of it is too slow to be of much use for anything, other than a very large RAM drive. I wouldn't bother trying to find anything larger than a 128MB Radeon 9200, unless you have some very odd need for a very large RAM: drive. OTOH 256MB Radeons aren't really more expensive that 128MB versions anyway.