What’s going on? In reality, maximum performance is a combination of four factors: the base clock frequency at which the memory operates, the number of data transfers possible per clock (DDR means double data rate), the width of each channel or memory bus (64 bits), and the number of channels used to transfer data to and from the CPU.
Say we have a 16GB kit (2 x 8GB) of dual-channel DDR4, with a base frequency of 1,600MHz. We can do the following calculation to figure out how much memory bandwidth we have. We take the 1,600 (MHz), break that down into Hz (1,600,000,000), and multiply it by the data rate (2) to get 3,200,000,000, aka 3,200MT/s (or 3,200MHz if you’re in marketing). Multiply that by 64 (the width of each…