The Lenovo X230 supports a faster memory clock speeds supported by processor than most portable PCs of this spec and age. This laptop supports a 1,600MHz processor memory clock speed, whereas most notebook PCs of a comparable age and type to 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 notebook PCs that have been on the market for around the same time as the X230.
The worst supported memory clock speeds supported by processor across comparable types of portable PC is 133MHz.