The ProBook 650 G1 supports a 1,600MHz processor memory clock speed which is faster than most laptops of this type and age. Most notebook PCs that came out around the same time as it support a 133MHz processor memory clock speed. This HP portable 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 amongst all medium processor core notebook PCs that are a comparable age to the ProBook 650 G1.
The worst supported memory clock speeds supported by processor across similar types of notebook PC is 133MHz.