The HP ZBook supports a 1,600MHz processor memory clock speed which is faster than most medium processor core laptops that were released more than two years ago. Most notebook PCs 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 actually the best supported memory clock speeds supported by processor across all notebook PCs of a comparable type and age to the ZBook.
Across similar types of notebook PC the worst supported memory clock speeds supported by processor is 133MHz.