The Lenovo L540 supports a 1,600MHz processor memory clock speed which is faster than most laptops that were launched around the same time as it. Most medium processor core laptops that are a similar age to it support a 133MHz processor memory clock speed. This portable 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 across all portable PCs of a similar age and spec to the L540.
The worst supported memory clock speeds supported by processor amongst similar types of portable PC is 133MHz.