DDR
The abbreviation of DDR is Double Data Rate and it is a type of memory integrated circuit used in Central Processing Units (CPU) of the computers. The bandwidth of the double data rate (DDR) is twice that of the single data rate (SDR). The twice bandwidth is achieved by transferring data of the clock signal on the rising and falling edges and not making any changes in the clock frequency. The DDR SDRAM can give a maximum transfer rate of 1600 MB/s for a bus frequency of 100MHz.
JEDEC (Join Electron Device Engineering Council) solid state technology association has set some standards for the speed of the DDR SDRAM. The standards are divided into two parts, where the first part is for the memory chips specification and the second part is for memory module.
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 AXIOM 1024 MB DDR MEMORY UPGRADE FOR DELL DESKTOPS USED  US $34.99
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 Kingston 2 gb KVR400AK2 2GR US $45.00
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 KINGSTON HYPERX DDR 400MHZ PC3200 2GB INTEL CPU 32GHZ US $110.00
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 1GB DDR PC2100 RAM Memory for eMachines T2682 US $49.59
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 NEW SAMSUNG 64MB 4 PC 800 45 Rambus Pentium 4 RAM US $10.18
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 Kingston 256MB PC2100 DDR Desktop Memory US $8.40
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 2 xCorsair VS1GB400C3 1GB PC 3200 DDR RAM US $25.01
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 Kingston 512mb DDR 400 Kit 2x256mb 1gb 4pcs US $9.99
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 2 x 1GB APACER PC2700 DDR333MHz non ECC Unb CL25 US $75.00
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 Compaq Presario 175925 001 512MB PC2100 DDR RAM Memory US $15.00
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 Nanya 256MB DDR Ram Kit US $.99
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 HP 305958 041 512MB PC2700 CL25 DDR Memory RAM US $20.00
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 PNY OPTIMA 2GB 2x1GB Dual Channel Kit DDR 400 MHz PC3 US $88.99
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 2 Sticks 0f 1 GB DDR Ram Total 2GB KVR333X64C25K2 2G US $49.25
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 1GBDDR266CL25ECC US $9.99
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 128MB RAM memory for Dell Optiplex GX240 desktop etc US $.99
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 HP Compaq Workstaion 261585 041 1 GB DDR DIMM Memory US $25.99
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 PC MAC RAM 2x 512MB PC2700 DDR 333 LOW DENSITY PC2700U US $31.95
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 2x 128MB DDR 266MHz PC2100U 25330 CL 25 Memory US $24.99
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 Avant 2GB DDR 400 PC3200 DIMM 2X1GB US $46.00
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 HP Compaq Workstaion 261583 031 256MB DDR DIMM Memory US $13.99
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 512MB PC3200 DDR 184PIN DIMM 64X64 400MHZ UNBUFF US $31.52
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 Dell Dimension 2400 8300 1GB PC2700 DDR Desktop Memory US $32.00
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 Future memory solutions Memory 256 MB US $302.99
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 Memory Upgrades Memory 4 GB 2 x 2 GB DIMM 184 p US $207.21
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 Memory Upgrades Memory 2 GB DIMM 184 pin DDR US $107.33
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 Dell Optiplex 160L 170L 1GB PC2700 DDR Desktop Memory US $32.00
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 OCZ technology 2gb2x1gb US $25.00
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 2 Corsair PC3200 256MB DDR400 Memory 512MB US $9.98
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 M368L1624DTM CB3 128MB DDR PC2700 333MHz CL25 Memory US $14.95
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 Apacer 512MB 2x256 RAM Memory DDR PC2100 CL2 US $20.00
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 512MB PC2100 DDR DELL DIMENSION 2350 2400 4400 4500 RAM US $18.59
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 Gateway Desktop Memory DDR 512MB PC 2700 333MHz DIMM US $15.50
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 Gateway Desktop Memory DDR 512MB PC 3200 400MHz DIMM US $15.50
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 Acer Desktop Memory DDR 512MB PC 2700 333MHz DIMM US $15.50
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 Acer Desktop Memory DDR 512MB PC 3200 400MHz DIMM US $15.50
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 Dell Desktop Memory DDR 512MB PC 3200 400MHz DIMM US $15.50
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 HP Desktop Memory DDR 512MB PC 2700 333MHz DIMM US $15.50
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 HP Desktop Memory DDR 512MB PC 3200 400MHz DIMM US $15.50
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 eMachines Desktop Memory DDR 512MB PC 2700 333MHz DIMM US $15.50
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 eMachines Desktop Memory DDR 512MB PC 3200 400MHz DIMM US $15.50
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 Dell Desktop Memory DDR 512MB PC 2700 333MHz DIMM US $15.50
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 512MB DDR PC2100 512 MB PC 2100 266 DESKTOP MEMORY NEW US $13.44
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 Dell Desktop Memory DDR 1GB PC 2700 333MHz DIMM US $37.95
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 Dell Desktop Memory DDR 1GB PC 3200 400MHz DIMM US $37.95
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 Acer Desktop Memory DDR 1GB PC 2700 333MHz DIMM US $37.95
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 Acer Desktop Memory DDR 1GB PC 3200 400MHz DIMM US $37.95
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 HP Desktop Memory DDR 1GB PC 2700 333MHz DIMM US $37.95
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 Gateway Desktop Memory DDR 1GB PC 2700 333MHz DIMM US $37.95
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 Gateway Desktop Memory DDR 1GB PC 3200 400MHz DIMM US $37.95
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 eMachines Desktop Memory DDR 1GB PC 3200 400MHz DIMM US $37.95
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 eMachines Desktop Memory DDR 1GB PC 2700 333MHz DIMM US $37.95
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 HP Desktop Memory DDR 1GB PC 3200 400MHz DIMM US $37.95
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 1GB PC2100 266 DDR RAM MEMORY US $20.50
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 256mb x7 DDR Desktop Memory US $7.99
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 2GB DDR PC2700 2 GB PC 2700 2X 1GB 333 DESKTOP MEMORY US $44.44
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 1GB DDR PC2700 1 GB PC 2700 333 DESKTOP MEMORY RAM NEW US $22.49
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 512MB DDR PC2700 512 MB PC 2700 333 DESKTOP MEMORY RAM US $13.44
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 1GB DDR PC2700 1 GB PC 2700 333 DESKTOP RAM LOW DENSITY US $39.99
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 2GB DDR PC2700 2X 1GB PC 333 DESKTOP RAM LOW DENSITY US $78.95
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