The XPS 12 9Q33 supports a 1,600MHz processor memory clock speed which is faster than most notebook PCs that have been around for a similar time to it. Most laptops of this type and age support a 133MHz processor memory clock speed. In addition, this notebook PC 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 comparable spec laptops that have been available for around the same time as the XPS 12 9Q33.
The worst supported memory clock speeds supported by processor across similar types of notebook PC is 133MHz.