The DELL Latitude E5440 supports a faster memory clock speeds supported by processor than most comparable spec laptops that have been available for around the same time as it. This DELL laptop supports a 1,600MHz processor memory clock speed, whereas most similar spec laptops that were released more than two years ago support a 133MHz processor memory clock speed. In addition, this notebook PC supports 1 and 333MHz processor memory clock speeds.
This laptop'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 a comparable spec and age to the Latitude E5440.
The worst supported memory clock speeds supported by processor amongst similar types of laptop is 133MHz.