Double data rate is one type of random access memory that a computer may use to function properly. While DRR4 memory may exist in 2012 and DDR5 does not yet exist, newer computers rely on DDR3 memory. Some computers still use DDR or DDR2 memory.
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Memory modules have a notch along the bottom that aligns with a bump in the memory slot in the computer. This notch is located in different places in all current models of DDR memory: DDR, DDR2 and DDR3. This prevents newer memory designs from being backward compatible or swappable.
Generally, DDR3 memory offers greater speeds than DRR2 memory. This results in a computer that may better handle multiple programs or demanding programs. DDR2 and DDR3 memory modules are also incompatible because they have different electricity needs. Each new version of DDR memory require less power than the previous version.
GDDR3, GDDR4 and GDDR5 are memory technologies specific to a computer's graphic cards. However, GDDR memory is not the same as DDR memory, which currently exists up to DDR3.
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