The DELL XPS 12 supports a 1,600MHz processor memory clock speed which is faster than most portable PCs of this spec and age. Most 2 in 1 laptops that were released more than two years ago 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 portable PCs of a similar type and age to the XPS 12.
Across similar types of laptop the worst supported memory clock speeds supported by processor is 133MHz.