The DELL XPS 15 supports a faster memory clock speeds supported by processor than most portable PCs that have been around for around the same time as it. This notebook PC supports a 1,600MHz processor memory clock speed, whereas most laptops of a similar type and age to it support a 133MHz processor memory clock speed. This 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 across all similar spec laptops that have been available for more than two years.
Across comparable types of portable PC the worst supported memory clock speeds supported by processor is 133MHz.