GTX 350 could easily be a medium-powered 55nm GT200 derivative on a 256-bit bus with 2 chips totaling 512-bit of GDDR5 bandwidth. This would be a very good option for Nvidia to pursue, I doubt with the "350" name it'll be a GPU that requires both 512-bit and GDDR5 for a single-core. After G80 I would have thought Nvidia would have learned about the problem of huge and hot cores, maybe GT300 will be smaller and scale like RV770.