Heh, even though I've been using 2048x2048 textures before now, though on an onboard chipset, with Quad2, nobody whinged about it not working, but you never know.
These days 2048x2048 would be on the upper limit I would think- the old onboard cards used system ram and used as much of it as they needed too, which would explain why the 2048x2048 textures worked.
These days 2048x2048 would be on the upper limit I would think- the old onboard cards used system ram and used as much of it as they needed too, which would explain why the 2048x2048 textures worked.