 Recent revisions of I2C can host more nodes and run at faster speeds (400 kbit/s "Fast mode", 1 Mbit/s "Fast mode plus", 3.4 Mbit/s "High Speed mode," and 5 Mbit/s "Ultra Fast-mode").These speeds are more widely used on embedded systems than on PCs.Note the bit rates are quoted for the transfers between master and slave without clock stretching or other hardware overhead.