Sdram Memory Module

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2GB 2 x 1GB Integral HYNIX PC 3200 DDR400 SDRAM PC 184 Pin Memory Modules    US $31.19

KINGSTON 1GB 2x 512MB PC2700 DDR SODIMM SDRAM LAPTOP MEMORY MODULE    US $51.99

1GB 2x 512MB PC2100 PC2700 DELL CERTIFIED DDR SODIMM SDRAM LAPTOP MEMORY MODULE    US $51.99

512MB PC2100 PC2700 DELL CERTIFIED DDR SODIMM SDRAM LAPTOP MEMORY MODULE    US $25.99

PNY 4GB DDR3 SDRAM Memory Module PC3 10666 1333Mhz    US $29.99

Infineon 2x128MB 256MB Total PC133 SDRAM Memory Module Pair    US $14.95

Dell 1GB Memory Module V220 220S DDR2 SDRAM 800MHz snpxg700c 1g    US $25.00

Kingston 512MB 133MHz PC133 168 Pin DIMM SDRAM Memory Module    US $7.70

Dell 1GB Memory Module V220 220S DDR2 SDRAM 800MHz snpxg700c 1g    US $22.00

NEC 128MB 133MHz PC133 CL3 168 Pin DIMM SDRAM Memory Module    US $5.00

Infineon 128MB 133MHz PC133 CL2 168 Pin DIMM SDRAM Memory Module    US $5.00

Hynix 128MB 133MHz PC133 CL2 168 Pin DIMM SDRAM Memory Module    US $5.00

Micron 1GB DDR3 SDRAM SODIMM Memory module    US $9.99

Dataram 16GB DDR2 SDRAM Memory Module DRI520P6 16GB FREE EXPIDITED SHIPPING    US $150.00

SAMSUNG 128MB 133MHz SDRAM MEMORY MODULE    US $7.99

Hewlett Packard Compaq128MB SDRAM PC100 16x72 ECC DIMM Single Rank Memory Module    US $29.99

2X 512MB 333MHz PC2700 DDR SDRAM Dual In Line memory module    US $.99

Lot 23x 256MB SDRAM 168 Pin PC133 LOW DENSITY Memory Bonus modules included    US $52.49

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DDR SDRAM RDRAM Memory Lot of 8 Modules    US $.99

H57V2562GTR SDRAM Board Synchronous DRAM Memory Evaluation Development Module    US $8.99

Kingston KTA MB1066K2 8G Apple 8GB DDR3 SDRAM Notebook Memory Module 2 x4GB    US $48.99

Crucial 4GB DDR3 SDRAM Memory Module CT2KIT25664BA1067    US $50.62

Kingston 512MB SDRAM Memory Module KTD DM133 512512MB 1 x 512MB 133MHz PC1    US $4.99

Memory Modules Large Lot SDRAM DDR PC100 PC133 PC2100 256 512 1GB Computer    US $44.99

DELL 1G 2 X 512MB PC133 SDRAM Non ECC 168 pin 33V 133MHz DIMM memory modules    US $14.99

4 SDRAM DDR MEMORY COMBO TRAY BOX FITS 40 DIMM OR 80 SODIMM MEMORY MODULES NEW    US $18.99

256MB PC133 SDR SDRAM DIMM Memory Module non ECC    US $4.85

2 Samsung M470L1714DT0 CB0 128MB 200pin DDR SDRAM SODIMM Memory Modules 256MB    US $7.50

128MB PC100 SDRAM 144 PIN SODIMM Laptop Memory Module    US $5.94

Kingston KTH MLG4 4G Kingston 4 GB DDR2 SDRAM Memory Module Kit    US $49.99

HP Elpida 2GB PC3 10600 Shared DDR3 1333MHz SDRAM Dual In Line Memory Module    US $.99

HP Samsung 2GB PC3 10600 Shared DDR3 1333MHz SDRAM Dual In Line Memory Module    US $.99

NEW Crucial 2GB DDR3 SDRAM Memory Module CT25664BC1067    US $5.00

Patriot Memory Gamer 2 32GB DDR3 SDRAM Memory Module 32 GB 4 x 8 GB DDR3    US $255.68

Corsair 2GB 667MHz PC2 5300 DDR2 SDRAM Memory Module    US $46.72

NEW Kingston Apple 16GB DDR3 SDRAM Memory Module 16GB    US $144.74

NEW Kingston 12GB DDR3 SDRAM Memory Module    US $137.99

Infineon HP 512MB 2x256 SDRAM Memory Modules 355949 888    US $10.00

NEW Kingston ValueRAM 8GB DDR3 SDRAM Memory Module    US $72.24

Hewlett Packard HP 4GB DDR3 1333 SDRAM memory module Samsung Manufactured    US $32.49

NEW Corsair Value Select 8GB DDR3 SDRAM Memory Module    US $50.24

4499 IBM16GB 4x4GB 276 Pin 400MHz DDR2 SDRAM Dimm Memory Module 12R8467    US $540.00

Kingston KVR133X64C3 512 512MB Memory SDRAM Module    US $12.90

NEW Avant 512MB DDR SDRAM Memory Module DDR40064X64    US $16.99

NEW Kingston KTM SX3138 4G 4GB DDR3 SDRAM Memory Module    US $43.74

Transcend 2gb Ddr2 Sdram Memory Module 2gb 533mhz Ddr2 533 pc2 4200 Ecc    US $43.92

NEW Kingston KTD L3B 4G 4GB DDR3 SDRAM Memory Module    US $31.24

NEW Crucial 2GB DDR2 SDRAM Memory Module CT25664AA667    US $28.23

NEW Corsair 8GB DDR3 SDRAM Memory Module    US $48.43

Value Select 2GB DDR2 SDRAM Memory Module 2GB 667MHz DDR2 667 PC2 5300 DDR2    US $45.44

Konica Minolta 256mb Ddr Sdram Memory Module 256mb 1 X 256mb Ddr Sdram    US $150.91

Crucial Ballistix Tactical 8GB DDR3 SDRAM Memory Module 8 GB 2 x 4 GB DDR3    US $55.96

Crucial Ballistix Tactical 4GB DDR3 SDRAM Memory Module 4 GB 2 x 2 GB DDR3    US $36.96

Crucial Ballistix Tactical 4GB DDR3 SDRAM Memory Module 4 GB 1 x 4 GB DDR3    US $28.37

Crucial Ballistix Tactical 2GB DDR3 SDRAM Memory Module 2 GB 1 x 2 GB DDR3    US $21.34

Crucial Ballistix Sport 12GB DDR3 SDRAM Memory Module 12 GB 3 x 4 GB DDR3    US $76.41

Crucial Ballistix Tactical 12GB DDR3 SDRAM Memory Module 12 GB 3 x 4 GB    US $78.35

Crucial Ballistix Sport 6GB DDR3 SDRAM Memory Module 6 GB 3 x 2 GB DDR3    US $47.25

NEW Crucial 4GB DDR2 SDRAM Memory Module    US $55.23

512 MB PC133 SDRAM Memory Modules Low Density 2x 256 MB    US $8.00

Kingston KVR533D2E4 1G 1 GB DDR2 SDRAM Memory Module ECC Unbuffered    US $35.13

Corsair Memory CMSG2GX3M1A1333 2 GB DDR3 SDRAM Memory Module 204 pin SoDIMM    US $14.82

Corsair 2GB DDR3 SDRAM Memory Module 1333MHZ NEW    US $36.57

Lenovo 2GB DDR3 SDRAM Memory Module 1066MHz 240 pin DIM    US $48.51

09N3352 IBM Memory M 128Mb 133Mhz Np Sdram Pc 133 Dimm Module    US $58.95

HP 516423 S21 HP 8GB DDR3 SDRAM Memory Module    US $826.01

HP 516423 S21 HP 8GB DDR3 SDRAM Memory Module Kit    US $892.09

Kingston KTD PE313 8G Kingston 8GB DDR3 SDRAM Memory Module Kit    US $106.83

Kingston KTD XPS730B 4G Kingston 4GB DDR3 SDRAM Memory Module Kit    US $51.43

Kingston KVR667D2S5K2 4G Kingston ValueRAM 4GB DDR2 SDRAM Memory Module Kit    US $94.59

Kingston KTH ZD8000B 2G Kingston 2GB DDR2 SDRAM Memory Module Kit    US $59.90

Kingston KTL TP667 2G Kingston 2GB DDR2 SDRAM Memory Module Kit    US $60.19

Kingston KTA MP1066 4G Kingston 4GB DDR3 SDRAM Memory Module Kit    US $60.01

Kingston KTD XPS730B 4G Kingston 4GB DDR3 SDRAM Memory Module    US $42.86

NEC 256MB PC100 168pin SDRAM Desktop Memory Module    US $6.99

Kingston KTH D530 256 256mb Ddr Sdram 184 pin Memory Module    US $29.99

Hp 335173 001 Hp Genuine 128mb 333mhz Pc2700 Non ecc Ddr Sdram Memory Module Dc5    US $29.99

Hp 345112 051 Hp Genuine 512mb Pc3200 400mhz Ddr2 Ecc Sdram Memory Module Prolia    US $29.99

Hp 345113 551 Hp Genuine 1gb Pc3200 400mhz Ddr2 Cl3 Ecc Sdram Memory Module Work    US $33.88

Hp 345112 551 Hp Genuine 512mb Pc3200 400mhz Ddr2 Ecc Sdram Memory Module Prolia    US $26.71

Hp 305956 041 Hp Genuine 128mb 333mhz Pc2700 Non ecc Ddr Sdram Memory Module Dc5    US $29.99

Hp 373029 951 Hp Genuine 1gb Pc3200 400mhz Ddr Cl3 Ecc Sdram Memory Module Works    US $34.99

Hp 384704 051 Hp Genuine 512mb Pc2 5300 667mhz Ddr2 Cl5 Ecc Sdram Memory Module    US $34.78

Hp 355951 888 Hp Genuine 512mb Pc2 4200 533mhz Cl4 Ddr2 Sdram Memory Module Dc76    US $39.99

Hp 345112 851 Hp Genuine 512mb Pc3200 400mhz Ddr2 Ecc Sdram Memory Module Prolia    US $27.21

Kingston ValueRAM 4GB DDR2 SDRAM Memory Module    US $130.65

Transcend JetRAM 1GB DDR2 SDRAM Memory Module    US $79.99

Corsair Value Select 1GB DDR SDRAM Memory Module    US $49.99

Centon 4GB DDR2 SDRAM Memory Module    US $119.99

416107 001 HP 2GB PC 3200 SDRAM MEMORY MODULE FOR DL140 145 G2 NEW BULK    US $17.00

Basics of DDR Memory Modules

The DDR, DDR2 and DDR3 memories have been based on the design of SDRAM or Synchronous Dynamic Random Access Memory. This means that they make use of the clock signal to synchronize things. DDR Ram can be termed as Double Data Rate which implies that the memories transfer two data chunks per clock cycle. In this way they are able to achieve double the performance of memories. Even the memories are labeled with double the real maximum clock rate that they can operate with. The DDR-800 memories can work at 400MHz. The DDR2-1066 and DDR-1066 memories at 533MHz and the DDR3-1333 memories at 666.6 MHz and so on.

These clock rates are the maximum that the memory can use in the official sense. While installing a DDR2-1066 memories on the computer which can access the memory subsystem at 400MHz or 800 MHz DDR the memories would be accessible at 400 MHz or 800 MHz DDR and not at 533 MHz or 1066 MHz DDR. This is possible as the clock signal has a memory controller that is a circuit situated outside the memory. It could be located in the north bridge chip from the motherboard or it could be embedded inside the CPU. This depends on the type of system.

We name the system DDRx-yyyy (x meaning the technology generation and yyyy the DDR clock rate) for the memory chips. The memory modules located on the little printed board where the memory chips are soldered into use another naming system PCx-zzzz. X is the technology generation and zzzz is the maximum bandwidth.

By this process we can find out how many bytes can be transferred per second between the memory controller and the memory module. This is based on the assumption that the data will get transferred on every single clock pulse. In order to arrive at the maximum theoretical transfer rate in MB/s i.e megabytes per second we can multiply the DDR clock in MHz by eight. For instance the DDR2-800 memories would have a maximum theoretical rate of 6400 MB/s by following the maths 800x8. The memory modules that use this kind of memory are called PC2-6400. These numbers can be understood as maximum theoretical numbers that can be never reached. It is because it doesn't really happen that the memory sends data to the memory controller every single clock cycle. It is important that the memory controller and the memory exchange their commands of instructing the memory to deliver data stored at a stated position. It is during such time that the memory won't transfer the data.

About the Author

The author is an expert writer in the field of the technology. Presently writing on various topics related to computer hardware and peripherals like computer RAM, USB drives, memory cards, memory modules and other computer products.

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JetRAM 1GB DDR SDRAM Memory Module $57.58 JetRAM 1GB DDR SDRAM Memory Module

ValueRAM 2GB DDR2 SDRAM Memory Module $75.4 ValueRAM 2GB DDR2 SDRAM Memory Module

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Kingston ValueRAM 4GB DDR2 SDRAM Memory Module $131.66 Kingston ValueRAM 4GB DDR2 SDRAM Memory Module

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IBM 8GB DDR3 SDRAM Memory Module 46C7451 $315.8 IBM 8GB DDR3 SDRAM Memory Module 46C7451

HP 4GB DDR3 SDRAM Memory Module 500660B21 $291.73 HP 4GB DDR3 SDRAM Memory Module 500660B21

Axiom 8GB DDR3 SDRAM Memory Module AX312920111 $63.99 Axiom 8GB DDR3 SDRAM Memory Module AX312920111

Axiom 4GB DDR3 SDRAM Memory Module MC243GAAX $43.39 Axiom 4GB DDR3 SDRAM Memory Module MC243GAAX

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