What is DDR transmission standard

Standard DDR SDRAM is divided into DDR 200, DDR 266, DDR 333 and DDR 400. Its standard operating frequencies are 100MHz, 133MHz, 166MHz and 200MHz, and the corresponding memory transmission bandwidths are 1.6GB/sec, 2.12GB/sec, and 2.66GB respectively. /sec and 3.2GB/sec, non-standard ones include DDR 433, DDR 500 and so on. Beginners are often confused by terms such as DDR 266 and PC 2100. I want to explain here that DDR 266 and PC 2100 are actually the same thing, but the expression method is different. DDR 266 refers to the operating frequency of the memory (the actual operating frequency is 133MHz, which is equivalent to 266MHz SDRAM), while PC 2100 refers to its memory transfer bandwidth (2100MB/sec). In the same way, PC 1600 is DDR 200, PC 2700 is DDR 333, and PC 3200 is DDR 400.

　　 DDR SDRAM memory transmission standard table:

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