The NP540U3C supports a 1,600MHz processor memory clock speed which is faster than most laptops of this age and spec. Most similar spec portable PCs that were released more than two years ago support a 133MHz processor memory clock speed. This Samsung 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 amongst all portable PCs that have been on the market for around the same time as the NP540U3C.
The worst supported memory clock speeds supported by processor across comparable types of portable PC is 133MHz.