The Acer Aspire S7-392 supports a 1,600MHz processor memory clock speed which is faster than most ultrabooks that have been around for a comparable time to it. Most notebook PCs that are a similar age to it support a 133MHz processor memory clock speed. In addition, this notebook 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 across all ultrabooks that are a similar age to the Aspire S7-392.
Across similar types of laptop the worst supported memory clock speeds supported by processor is 133MHz.