Tom's Hardware: Topic Whis is GDDR3
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DDR3 SDRAM or double-data-rate three synchronous dynamic random access memory is a random access memory interface technology used for high bandwidth storage of the working data of a computer or other digital electronic devices.
Graphics Double Data Rate 3 (GDDR3) is a graphics card-specific memory technology.
So unless you are building a graphics card, stick with DDR3 
DDR3
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