The DELL XPS 13 supports a 1,600MHz processor memory clock speed which is faster than most portable PCs of this type and age. Most ultrabooks 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.
This laptop's memory clock speeds supported by processor (1,600MHz) is actually the best supported memory clock speeds supported by processor across all portable PCs that came out around the same time as the XPS 13.
Across similar types of laptop the worst supported memory clock speeds supported by processor is 133MHz.