The HP ProBook 650 supports a 1,600MHz processor memory clock speed which is faster than most medium processor core laptops that were launched more than two years ago. Most medium processor core laptops that came out around the same time as it support a 133MHz processor memory clock speed. This HP laptop 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 laptops of a comparable spec and age to the ProBook 650.
Across similar types of laptop the worst supported memory clock speeds supported by processor is 133MHz.