> > The team says that other technological hurdles would arise long before optoelectronic devices reach the realm of PHz. Yup... just the memory access (even i

> > The team says that other technological hurdles would arise long before optoelectronic devices reach the realm of PHz. Yup... just the memory access (even if "instant", ram is so "far away" (physically) that the transmission delay will be many multiples of the clock... Currently this is a pain to implement correctly by the CPU manufacturers, but atleast with caches you don't run out of data to calculate while waiting for something new from RAM.