The Lenovo B590 supports a 1,600MHz processor memory clock speed which is faster than most medium processor cores portable PCs that came out around the same time as it. Most similar spec notebook PCs that are a comparable age to it support a 133MHz processor memory clock speed. This portable PC also 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 portable PCs that have been on the market for more than two years.
The worst supported memory clock speeds supported by processor across similar types of portable PC is 133MHz.