These numbers generally follow the speed rating corresponding to the generational standard: “DDR3 1600 RAM” is also labelled as “PC3 12800,” “DDR4 2400 RAM” is also “PC4 19200,” and so on. Though the speed rating is usually expressed in straight “DDR” terms, we also have the old PC2/PC3/PC4 standard still hanging on.
Things start to get complicated in the nomenclature.
It’s no longer simply an expression of clock speed, like a processor, but a combination of hardware factors. The formula for the exact speed rating changes slightly based on the version of DDR memory your computer is using (see below). The faster the number, the faster your computer can store and retrieve the data stored in local memory. The speed rating of your RAM module is an expression of its data transfer rate.
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