NVidia architeture at 55 nm

Source: VR Zone

While AMD graphics chips are engraved at 55 nm, NVidia's are still 65. Finer engraving allows not only better power consumption and an increase in frequency, but also stamping out more chips on each silicon waffer and thus reduces the manufacturing costs.
NVidia is expected to engrave chips at this level soon enough. Nothing will change in the architecture of their products. They should offer the G94b and G96b chips. As is often the case, the smaller die size benefits products for laptops, where the power consumption/output ratio is especially critical.