The Latitude E6540 supports a faster memory clock speeds supported by processor than most portable PCs of a similar type and age to it. This portable PC supports a 1,600MHz processor memory clock speed, whereas most portable PCs that were released more than two years ago support a 133MHz processor memory clock speed. In addition, this DELL portable 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 around for around the same time as the Latitude E6540.
The worst supported memory clock speeds supported by processor across similar types of portable PC is 133MHz.