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

Category : Specification / Capacity / Performance
DDR data transfer rates: 
DDR 266:2.1 GB/s
DDR 333:2.6 GB/s
DDR 400:3.2 GB/s


DDR2 data transfer rates: 
DDR2 533:4.2 GB/s
DDR2 667:5.3 GB/s
DDR2 800:6.4 GB/s


DDR3 data transfer rates: 
DDR3 1066:8.5 GB/s
DDR3 1333:10.6 GB/s
DDR3 1600:12.8 G MB/s
DDR3 1866:14.9 G MB/s


DDR4 data transfer rates:
DDR4 2133:17 GB/s
DDR4 2400:19.2 GB/s
DDR4 2666:21.3 GB/s
DDR4 3200:25.6 GB/s
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