I am re-reading and re-editing my notes that I am studying for my A+ certification, and I am looking at the concept of MT/s, which stands for megatransfers per second. According to the author, megatransfers started to be used as a measurement for bandwidth with DDR4 memory modules. According to the charts provided by the author, the formula for megatransfers is clock speed x 8. So a DDR4 memory module with a clock speed of 200 MHz would have a bandwidth of 1600 MT/s, hence DDR4-1600. However, when I look up the concept of megatransfers on PCMag.com explains that the formula is actually clockspeed x 2, calculating both the rising and falling edges of the clock. Thus, under this definition, a DDR4 memory module with a clock speed of 400 MHz would be 800 MT/s.