The Aspire V7-581 supports a 1,600MHz processor memory clock speed which is faster than most laptops that are a comparable age to it. Most ultrabooks 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 in fact the best supported memory clock speeds supported by processor amongst all similar spec laptops that have been available for more than two years.
The worst supported memory clock speeds supported by processor amongst similar types of laptop is 133MHz.