Differences between Socket 5 and Socket 7 are that Socket 7 has an extra pin and is designed to provide dual split rail voltage, as opposed to Socket 5's single voltage.
Socket 7, в отличие от Socket 5, позволяет подавать на процессор два напряжения питания, первое для блоков ввода/вывода процессора и второе для ядра процессора.