The DELL XPS 13 supports a faster memory clock speeds supported by processor than most laptops of a comparable age and spec to it. This portable PC supports a 1,600MHz processor memory clock speed, whereas most ultrabooks that were released more than two years ago support a 133MHz processor memory clock speed. In addition, this laptop 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 similar spec notebook PCs that were launched around the same time as the XPS 13.
The worst supported memory clock speeds supported by processor across comparable types of portable PC is 133MHz.