when you hook two routers through serial ports you are given the chance to set the clock rate. For instance 64000. The clock rate can be altered by the engineer. I know the standard is usually about 64000 but I know that it can go much higher than that.
That's the clockrate of the serial link. You can go above 64000 and not hurt anything, you'll just be emulating a faster circuit. I thought you were talking about overclocking the CPU.
