RAM Types

       

DDR SDRAM – 184-pin SDRAM, 200-pin SO-DIMM
Introduced in 2001. Transfers data twice per clock cycle, doubling the data rate
Standard Name Memory Clock Cycle Time I/O Bus clock Data transfers per second Module Name Peak transfer rate
DDR-200 100 Mhz 10 ns 100 Mhz 200 million PC-1600 1600 MB/s
DDR-266 133 Mhz 7.5 ns 133 MHz 266 million PC-2100 2100 MB/s
DDR-300 150 Mhz 6.67 ns 150 MHz 300 million PC-2400 2400 MB/s
DDR-333 166 Mhz 6 ns 166 Mhz 333 million PC-2700 2700 MB/s
DDR-400 200 Mhz 5 ns 200 MHz 400 million PC-3200 3200 MB/s
             

Micron DDR SDRAM SODIMM Data sheet

 


DDR2 SDRAM – 240 Pin DIMM, 200 Pin SO-DIMM
Introduced in 2004
Standard Name Memory Clock Cycle Time I/O Bus clock Data transfers per second Module Name Peak transfer rate
DDR2-400 100Mhz 10 ns 200 Mhz 400 million PC2-3200 3200 MB/s
DDR2-533 133Mhz 7.5 ns 266 MHz 533 million PC2-4200 4266 MB/s
DDR2-667 166Mhz 6 ns 333 MHz 667 million PC2-5300 5333 MB/s
DDR2-800 200Mhz 5 ns 400 Mhz 800 million PC2-6400 6400 MB/s
             

DDR3 SDRAM – 240 Pin DIMM, 204 Pin SO-DIMM
 
Standard Name Memory Clock Cycle Time I/O Bus clock Data transfers per second Module Name Peak transfer rate
DDR3-800 100Mhz 10 ns 400 Mhz 800 million PC3-6400 6400 MB/s
DDR3-1066 133.3Mhz 7.5 ns 533.3 MHz 1066.6 million PC3-8500 8533.3 MB/s
DDR3-1333 166.6Mhz 6 ns 666.6 MHz 1333.3 million PC3-10600 10666.6 MB/s
DDR3-1600 200Mhz 5 ns 800 Mhz 1600 million PC3-12800 12800 MB/s
DDR3-1866 233.3Mhz 4.3 ns 933.3 Mhz 1866.6 million PC3-14900 14933.3 MB/s
DDR3-2133 266.6Mhz 3.75 ns 1066.6 Mhz 2133.3 million PC3-17000 17066.6 MB/s
             

DDR4 SDRAM – 288 Pin DIMM, 260 Pin SO-DIMM
 
Standard Name Memory Clock Cycle Time I/O bus clock (MHz) Data Rate (MT/s) Module Name Peak transfer rate
DDR4-1600      800 1600 PC4-1600   12800
DDR4-1866      933⅓ 1866⅔ PC4-1866  14933⅓
DDR4-2133      1066⅔ 2133⅓ PC4-2133  17066⅔
DDR4-2400      1200 2400 PC4-2400  19200

 


Links to articles:

SDRAM http://en.wikipedia.org/wiki/SDRAM