After the 10GHz milestone is reached in mainstream PCs, how will the next speeds look like? Will they slowly evolve 1GHz at a time, or will we see a very rapid approach to 20GHz? How long after 10GHz do you think 20GHz will come out? I would guess it would be similar to the time it took from the 1GHz milestone to reaching 2GHz. There is probably a mathematical formula that would answer these questions :?