RAM (Memory)

Memory - DDR2 DDR3 SDRAM

Memory is the name given to silicon chips that stores volatile computer data. Volatile means that the contents of memory will be lost if the power of the computer is switched off. Memory stores some of your operating system and application data while it is being run. The more memory you have in your system, the more application you can run simultaneously and will provide an overall better system performance.
Memory comes in many form. The older systems use SDRAM, while the current systems use DDR2 or DDR3 SDRAM (Double Data Rate Synchronous Dynamic Random Access Memory).
Depending on the motherboard you choose you need to select the matching compatible memory. For example if you buy an Intel motherboard for an Intel Core 2 Duo CPU then it will support Dual-channel DDR2 800, 667 or 533. Therefore you can buy any DDR2 memory at those speeds. However DDR2-800 memory will run the CPU bus at the optimal speed while slower memory are backward compatible. It is recommended that you get the highest memory speed your motherboard supports if you want the maximum performance. If you are on a budget then slower speed memory would be sufficient. Please note, DDR-2 memory must be run in pairs to run at double data rate. So if you decide to get 2GB of memory then you need to buy 2 x 1GB modules. It is also best to get both pairs of memory from the same manufacturer to avoid incompatibility.
Most AMD Athlon 64 X2 and Phenom processors also support DDR-2 at speeds mentioned above.
If you have the latest Intel i7 motherboard then you will need a triple-channel DDR3 1600, 1333, or 1066.
It is always best to ask your retailer or check the manufactures website to make sure that your chosen memory is compatible with your chosen motherboard. Some of the well known memory manufactures are Crucial, Kingston, Corsair, and Samsung. The following list shows all the current types of DDR2 and DDR3 memory.
DDR2 Memory:
Memory nameI/O Bus SpeedModule name
DDR2-400200 MHzPC2-3200
DDR2-533266 MHzPC2-4200
DDR2-667333 MHzPC2-5300
DDR2-800400 MHzPC2-6400
DDR2-1066533 MHzPC2-8500
DDR3 Memory:
Memory nameI/O Bus speedModule name
DDR3-800400 MHzPC3-6400
DDR3-1066533 MHzPC3-8500
DDR3-1333667 MHzPC3-10600
DDR3-1600800 MHzPC3-12800

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