A key factor for a MOS transistor is the gate's width/length ratio, since the current is proportional to this. This ratio is tuned to the particular role of the

A key factor for a MOS transistor is the gate's width/length ratio, since the current is proportional to this. This ratio is tuned to the particular role of the transistor, usually by adjusting the width. Sometimes the gate zig-zags to fit the width into the available space. As far as clocks, four-phase clocks were popular for a short time earlier. I don't know details of the clocks in modern processors, so maybe someone can comment.