What are the data transfer rates for DDR, DDR2, DDR3 and DDR4?

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The table is compared speed with peak transfer rate     RAM Type      Speed      Peak Transfer Rate*        DDR      266      2.1 GB/s        333      2.7GB/s        400      3.2 GB/s        DDR2      533      4.27 GB/s        667      5.33 GB/s        800      6.4 GB/s        DDR3      1066      8.5 GB/s        1333      10.6 GB/s        1600      12.8 GB/s        1866      14.9 GB/s        DDR4      2133      17 GB/s        2400      19.2 GB/s        2666      21.3 GB/s        3200      25.6 GB/s        Note:   * The practical data rate is determined by the system's Central Processing   Unit and motherboard configuration.

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What are the data transfer rates for DDR, DDR2, DDR3 and DDR4?

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RAM Type	Speed	Peak Transfer Rate*
DDR	266	2.1 GB/s
	333	2.7GB/s
	400	3.2 GB/s
DDR2	533	4.27 GB/s
	667	5.33 GB/s
	800	6.4 GB/s
DDR3	1066	8.5 GB/s
	1333	10.6 GB/s
	1600	12.8 GB/s
	1866	14.9 GB/s
DDR4	2133	17 GB/s
	2400	19.2 GB/s
	2666	21.3 GB/s
	3200	25.6 GB/s
Note: * The practical data rate is determined by the system's Central Processing Unit and motherboard configuration.