The HP ZBook supports a 1,600MHz processor memory clock speed which is faster than most medium processor core notebook PCs that were launched around the same time as it. Most portable PCs that were released more than two years ago support a 133MHz processor memory clock speed. This HP laptop also supports 1 and 333MHz processor memory clock speeds.
This notebook PC's memory clock speeds supported by processor (1,600MHz) is in fact the best supported memory clock speeds supported by processor across all comparable spec portable PCs that have been available for more than two years.
The worst supported memory clock speeds supported by processor across similar types of notebook PC is 133MHz.