The ZBook 15 supports a faster memory clock speeds supported by processor than most notebook PCs of this spec and age. This notebook PC supports a 1,600MHz processor memory clock speed, whereas most similar spec notebook PCs that were released more than two years ago support a 133MHz processor memory clock speed. This HP notebook PC also 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 many processor core portable PCs that have been available for more than two years.
Across similar types of portable PC the worst supported memory clock speeds supported by processor is 133MHz.