The Lenovo L540 supports a 1,600MHz processor memory clock speed which is faster than most portable PCs of this age and spec. Most medium processor core notebook PCs that have been on the market for a comparable time to it support a 133MHz processor memory clock speed. In addition, this laptop supports 1 and 333MHz processor memory clock speeds.
A 1,600MHz processor memory clock speed is actually the best supported memory clock speeds supported by processor across all laptops of a similar spec and age to the L540.
Across similar types of notebook PC the worst supported memory clock speeds supported by processor is 133MHz.