The ProBook 450 G1 supports a 1,600MHz processor memory clock speed which is faster than most laptops of this spec and age. Most medium processor core notebook PCs that were launched around the same time as it support a 133MHz processor memory clock speed. This laptop 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 amongst all notebook PCs of this age and type.
A 133MHz processor memory clock speed is the worst supported memory clock speeds supported by processor amongst comparable types of notebook PC.