I've heard of certain Amigas having up to 8Mb of GFX RAM. I wonder why something like that couldn't be done with this?
Certain Amigas with an 8 MB CyberVisionPPC or BlizzardVisionPPC RTG card do, most other RTG cards have from 1 to 4 MB; unless you mean the non-functional 2/8 MB JUMPER on A4000 motherboards meant for a non existent AAA (as opposed to the AGA) chip.