The ProBook 650 supports a 1,600MHz processor memory clock speed which is faster than most medium processor core laptops that have been around for more than two years. Most portable PCs of this age and type support a 133MHz processor memory clock speed. This notebook PC also 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 similar spec laptops that have been available for around the same time as the ProBook 650.
A 133MHz processor memory clock speed is the worst supported memory clock speeds supported by processor amongst comparable types of notebook PC.