DDR2 (Double Data Rate Two) SDRAM (Synchronous Dynamic Random Access Memory) is another type of RAM in the SDRAM family. It is the widely popular successor to DDR SDRAM, and used in most recent computers.
The difference between DDR and DDR2 is that the latter transfers data twice as fast is the former. This is achieved by operating the memory cells at half the clock rate of DDR SDRAM, and by improving bus signal. For example, if a stick of DDR SDRAM operating at 133mhz has a maximum transfer rate of 2100MB/s, then a stick of DDR2 SDRAM operating at the same clock rate would have a maximum rate of 4200MS/s.
 1GB PC2 6400u 666 NANYA DESKTOP RAM MEMORY FAST GOOD US $22.99 |
 8GB 2x 4GB Kit Memory RAM Apple Mac Pro 8 core FB ECC US $318.30 |
 PC RAM 1G PAIR Edge 4935401 53 US $20.00 |
 LOT 39 DDR2 PC2 memory ram desktop 512MB 256MB non ecc US $219.99 |
 2GB 2X1GB PC2 5300 memory ram Desktop DDR2 667MHz US $44.99 |
 8GB 2x4GB PC2 5300F DDR2 667MHz ECC Fully Buffered US $235.00 |
 2GB 2x1GB DELL PC6400 Vostro 220 memory DDR2 800 new US $37.00 |
 Kingston 2 gigabyte DDR 2 DIMM RAM memory PC6400 US $47.95 |
 Patriot Viper 4GB 2 x 2GB 240 Pin DDR2 SDRAM DDR2 106 US $90.00 |
 Samsung 2GB1GBX2 PC2 4200 Memories Used but Works US $30.00 |
 Samsung DDR2 2GB 2Rx8 PC2 6400U Memory Module US $30.00 |
 512MB PC2 4200 DDR2 533MHz non ECC US $25.00 |
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