The Latitude E6540 supports a 1,600MHz processor memory clock speed which is faster than most comparable spec notebook PCs that have been available for more than two years. Most portable PCs of a comparable spec and age to it support a 133MHz processor memory clock speed. In addition, this notebook PC 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 amongst all medium processor core notebook PCs that have been on the market for around the same time as the Latitude E6540.
A 133MHz processor memory clock speed is the worst supported memory clock speeds supported by processor amongst similar types of portable PC.