The Inspiron 15 supports a 1,600MHz processor memory clock speed which is faster than most portable PCs that have been available for more than two years. Most medium processor core laptops that were released around the same time as it support a 133MHz processor memory clock speed. This notebook PC also 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 portable PCs of a similar age and type to the Inspiron 15.
Amongst similar types of laptop the worst supported memory clock speeds supported by processor is 133MHz.