The DELL Latitude E6540 supports a faster memory clock speeds supported by processor than most laptops of this age and spec. This notebook PC supports a 1,600MHz processor memory clock speed, whereas most notebook PCs that were launched around the same time as it support a 133MHz processor memory clock speed. In addition, this portable PC supports 1 and 333MHz processor memory clock speeds.
A 1,600MHz processor memory clock speed is actually the best supported memory clock speeds supported by processor amongst all portable PCs of a similar age and type to the Latitude E6540.
The worst supported memory clock speeds supported by processor amongst similar types of portable PC is 133MHz.