Most ATI's still have 1gb ddr5 - it's only non ref high performance pieces that offer 2gb, and often with little gain. 5770 has 128bit bus width - positively archaic. Now let's see what happens when Nvidia upscales GF104 hey.
The GF104 is already upscaled, it is called the GF100. Nvidia fans can only look forward to downscaling ala GF108. I fail to see how a mid range card can generate so much excitement, as it is not even driving down the competitions prices.