Of course, we are hardly seeing the benefit of 512MB cards right now, so 1024MB is just outrageous. It’s not the fact that we need it though, it’s the fact that they are possible.
We asked around and it turns out that the R520 memory controller is very flexible, and can support even future memory standards such as GDDR4 but more interesting is the fact that it will let you use more than 512MB of memory.
If these things do come to be, then you can expect them to cost at least $200 more than a standard high-end 256MB card. Check out the full posting at The Inquirer.