● DDR1 represents 1 generation of memory, DDR2 represents 2 generations of memory, DDR3 represents 3 generations of memory, and
DDR4 represents 4 generations of memory;
● "2400" in DDR4 2400 means that the memory frequency is 2400MHz, and the common memory frequency is 1333, 1600, 1866.
● 2133, 2400, etc. In short, the higher the frequency, the faster the speed
● The same generation of memory, the frequency can be backward compatible. For example, the frequency of DDR3 is 1333, 1600, 1866.