The Lenovo L540 supports a 1,600MHz processor memory clock speed which is faster than most portable PCs of this spec and age. Most portable PCs of this age and type support a 133MHz processor memory clock speed. This Lenovo laptop 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 notebook PCs of a similar age and type to the L540.
Across comparable types of laptop the worst supported memory clock speeds supported by processor is 133MHz.