I`m not sure if this will be a full-blown CPU, or just a simple clock oscillator. When I see Intel/AMD stuff at these speeds, I`ll believe it BUT (here comes the circuit and semicon theory)
lets assume a signal path is 1cm long
if the signal travels at the speed of light 3x10^8 m/s it will take:
3.33x10^-11 seconds to travel the path.
if a CPU has a clock speed of 350GHz...the pulse period is 2.85x10^-12
Thats less than the time it takes for the signal to travel 1cm.
If all the sections of the CPU are clocked simultaneously...the CPU will fall over "instantly"
For this to stand a chance, the sctions of the CPU will need to be asynchronous.
More theory to come, just ask! I have a degree in this now