Very generally ,both bus clock speed and bus power(per bit) are proportional to the parasitic capacitor that's formed between any two bus wires which is propor

Very generally ,both bus clock speed and bus power(per bit) are proportional to the parasitic capacitor that's formed between any two bus wires which is proportional to their length. This is because every new bit on the bus needs to charge this parasitic capacitor and this takes time and power.