The energy demand level of the processors is marked by prefixed letters in the model name: X ... Extreme (fastest) version with the highest current consumption E ... > 55 Watt (Desktop PCs) T ... 30-39 Watt (Standard laptop CPUs) P ... max 25 Watt L ... 12-19 Watt (Low Voltage) U ... <11.9 Watt (Ultra Low Voltage)