The Asus X551CA supports a 1,600MHz processor memory clock speed which is faster than most similar spec laptops that have been on the market for around the same time as it. Most similar spec notebook PCs that were released more than two years ago support a 133MHz processor memory clock speed. This notebook PC also supports 1 and 333MHz processor memory clock speeds.
This laptop's memory clock speeds supported by processor (1,600MHz) is actually the best supported memory clock speeds supported by processor amongst all portable PCs of this age and spec.
Amongst similar types of laptop the worst supported memory clock speeds supported by processor is 133MHz.