The Lenovo X240 supports a 1,600MHz processor memory clock speed which is faster than most ultrabooks that have been available for around the same time as it. Most ultrabooks that are a comparable age to it support a 133MHz processor memory clock speed. This notebook PC also supports 1 and 333MHz processor memory clock speeds.
A 1,600MHz processor memory clock speed is in fact the best supported memory clock speeds supported by processor amongst all laptops of a comparable spec and age to the X240.
The worst supported memory clock speeds supported by processor across similar types of notebook PC is 133MHz.