The DELL XPS 15 supports a 1,600MHz processor memory clock speed which is faster than most similar spec notebook PCs that came out more than two years ago. Most many processor core portable PCs that were released more than two years ago support a 133MHz processor memory clock speed. This laptop also supports 1 and 333MHz processor memory clock speeds.
This notebook PC's memory clock speeds supported by processor (1,600MHz) is in fact the best supported memory clock speeds supported by processor across all notebook PCs of this age and spec.
Across comparable types of notebook PC the worst supported memory clock speeds supported by processor is 133MHz.