Man, they do 350GHz at room temperature!!!
100 times the competition!
As for cost, they have not even mentioned the capabilities of this chip. But the fact that they can get an entire chip running at that speed is amazing. Till now, only individual transistors had touched that. Cost they say is expensive, but with mass production it may come down. After all, if you have a full function chip made with SiGe, you can do away with separate GPUs, audio, etc etc.