The ProBook 650 supports a 1,600MHz processor memory clock speed which is faster than most medium processor core notebook PCs that have been around for a comparable time to it. Most medium processor core notebook PCs that came out around the same time as it support a 133MHz processor memory clock speed. In addition, this portable PC supports 1 and 333MHz processor memory clock speeds.
A 1,600MHz processor memory clock speed is in fact the best supported memory clock speeds supported by processor across all laptops of a similar type and age to the ProBook 650.
Across similar types of notebook PC the worst supported memory clock speeds supported by processor is 133MHz.