[pjscott]

Note that just because someone's invented transistors that can switch at 300 GHz, doesn't mean that you can make a processor which will be able to run with a 300 GHz clock speed. These are two completely different issues, and articles with things like "300 GHZ!" in the headlines often play off this confusion to get page views.

There are already transistors which can switch at much higher frequencies. They're mainly used in radio communications. The promise of graphene semiconductors is that they may be a way of replacing or supplementing silicon, so it's nice that graphene transistors are turning out to have good performance, but the really big issue continues to be figuring out how to mass-produce non-trivial devices. Or even trivial ones.