The Samsung NP540U3C supports a 1,600MHz processor memory clock speed which is faster than most comparable spec laptops that have been on the market for around the same time as it. Most ultrabooks that are a similar age to it support a 133MHz processor memory clock speed. This 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 amongst all laptops that have been around for a comparable time to the NP540U3C.
Amongst comparable types of portable PC the worst supported memory clock speeds supported by processor is 133MHz.