DDR (Double Data Rate) is a type of SDRAM (Synchronous Dynamic Random Access Memory). It has double the bandwidth of it's predecessor, SDRAM. DDR SDRAM is the most common type of desktop RAM.
The transfer rate of DDR SDRAM is determined by the formula: (clock rate) x (dual rate) x (number of bits transferred) / (number of bits per byte). For example, a stick of DDR SDRAM with a clock rate of (133)mhz x (2) data rate x (64) transfer rate / (8) bits per byte, would have a maximum transfer rate of 2100MB/s and would therefore be listed as PC-2100 RAM.
 PC2700 512 DDR MEMORY MODULE ROHs COMPLIANT NON ECC US $80.00 |
 Infineon Ram 800 40 512MB 2X256 US $11.50 |
 NEW CRUCIAL 1GB DDR PC2 4200 MEMORY CT12864AC53E US $30.00 |
 samsung 512MB X2 1rx8 PC2 4200 US $20.00 |
 256 MB PC2700 DESKTOP MEMORY US $4.75 |
 LOTTO MEMORIE 512 MB 2X256 DDR 333 PC 2700 US $16.91 |
 K Byte 512MB PC3200 DDR Desktop Memory 512MB US $24.99 |
 2 sticks of 128meg DDR400 DIMM RAM memory PC3200 US $8.95 |
 Netlist RAM Memory 2GB 2x1GB PC2700 registered ECC US $30.00 |
 512MB PC3200 DDR DIMM Desktop Computer Memory US $66.00 |
 Kingston 1 gigabyte DDR400 DIMM RAM memory PC3200 US $45.95 |
 DDR PC3200 512mb 2x256 US $12.00 |
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