The Sony VAIO Pro 13 SVP1321X9E supports a 1,600MHz processor memory clock speed which is faster than most ultrabooks that have been on the market for around the same time as it. Most ultrabooks that have been on the market for a comparable time to it support a 133MHz processor memory clock speed. In addition, this Sony portable PC supports 1 and 333MHz processor memory clock speeds.
This notebook PC's memory clock speeds supported by processor (1,600MHz) is in fact the best supported memory clock speeds supported by processor across all notebook PCs of a similar spec and age to the VAIO Pro 13 SVP1321X9E.
The worst supported memory clock speeds supported by processor amongst similar types of notebook PC is 133MHz.