The Inq reports NVIDIA has decided to launch a new GeForce 6600 which uses DDR2 memory:
The board comes with boosted specs compared to the original 6600. The GPU clock is raised 15% to 350MHz, while DDR-2 memory rocks at 800MHz, compared to 550MHz on the original 6600s. That raises theoretical bandwidth by a full 4GB/s to 12.8GB/s. The amount of memory is boosted as well, from 128MB to 256MB - thanks to Nvidia using BGA packaging, which takes less space than the old fashioned TSOP.