The ProBook 440 G1 supports a 1,600MHz processor memory clock speed which is faster than most similar spec notebook PCs that have been on the market for around the same time as it. Most portable PCs of a similar spec and age to it support a 133MHz processor memory clock speed. This notebook PC also supports 1 and 333MHz processor memory clock speeds.
This notebook PC's memory clock speeds supported by processor (1,600MHz) is in fact the best supported memory clock speeds supported by processor across all medium processor core notebook PCs that came out around the same time as the ProBook 440 G1.
Across similar types of notebook PC the worst supported memory clock speeds supported by processor is 133MHz.