The ProBook 450 supports a 1,600MHz processor memory clock speed which is faster than most laptops that are a similar age to it. Most similar spec notebook PCs that have been around for around the same time as it support a 133MHz processor memory clock speed. This notebook PC also supports 1 and 333MHz processor memory clock speeds.
This portable PC's memory clock speeds supported by processor (1,600MHz) is actually the best supported memory clock speeds supported by processor across all notebook PCs of this spec and age.
A 133MHz processor memory clock speed is the worst supported memory clock speeds supported by processor across similar types of portable PC.