Less power consumption and/or the ability to cram more transistors into the same area. Less power consumption also means less heat generated. I think heat diss

Less power consumption and/or the ability to cram more transistors into the same area. Less power consumption also means less heat generated. I think heat dissipation is the main roadblock to faster CPUs (faster in terms of clock speed). IANAEE but I think the speed of light becomes a big issue at higher clock speeds. Putting transistors physically closer to each other helps reduce problems with propagation delay.