DRAM - What do the DDR speeds refer to?

DDR can manipulate data two times per clock cycle. This means the output is twice that of the front side BUS (FSB).

DDR Output FSB Peak Bandwidth
PC1600 200Mhz 100Mhz 1.6GB/sec
PC2100 266Mhz 133Mhz 2.1GB/sec
PC2700 333Mhz 166Mhz 2.7GB/sec
PC3200 400Mhz 200Mhz 3.2GB/sec

DDR2 Output FSB Peak Bandwidth
PC2-3200 400Mhz 200Mhz 3.2GB/sec
PC2-4200 533Mhz 266Mhz 4.2GB/sec
PC2-5300 667Mhz 333Mhz 5.3GB/sec
PC2-6400 800Mhz 400Mhz 6.4GB/sec

DDR2 3 Output FSB Peak Bandwidth
PC3-6400 800Mhz 400Mhz 6.4GB/sec
PC3-8500 1066Mhz 533Mhz 8.5GB/sec
PC3-5300 1333Mhz 666Mhz

10.6GB/sec

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