The HP ENVY 15 supports a 1,600MHz processor memory clock speed which is faster than most portable PCs of this age and spec. Most medium processor core notebook PCs that have been on the market for around the same time as it support a 133MHz processor memory clock speed. This portable 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 amongst all comparable spec notebook PCs that came out around the same time as the ENVY 15.
The worst supported memory clock speeds supported by processor across comparable types of notebook PC is 133MHz.