The Macbook Pro Early 2013 Retina supports a 1,600MHz processor memory clock speed which is faster than most notebook PCs of a similar spec and age to it. Most MacBooks that were released one year ago support a 133MHz processor memory clock speed. In addition, this Apple laptop supports 1 and 333MHz processor memory clock speeds.
A 1,600MHz processor memory clock speed is in fact the best supported memory clock speeds supported by processor amongst all MacBooks that have been around for a similar time to the Macbook Pro Early 2013 Retina.
The worst supported memory clock speeds supported by processor amongst similar types of laptop is 133MHz.