Differences between GDDR5 and DDR3

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Hardware DDR3 GDDR5 Graphics Graphics Cards
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DDR stands for Double Data Rate, the number following indicates the version. GDDR is for Graphical Double Data Rate, and as the name implies is specially designed to be used in graphics hardware. Some graphics hardware uses DDR3 memory, but this doesn't go the other way, as you cannot buy sticks of GDDR5 ram to put in your PC.

They're more similar that you might think though, as GDDR5 is actually a normal DDR3 memory module with added prefetch buffers (8-bit).

GDDR5 is faster for large amounts of data (like a constantly changing buffered video stream) in and out, but DDR3 is actually faster for smaller files, like the one's an operating system opens and closes occasionally.

Both are optimized for their purpose.