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I am trying to buy a laptop, and I have seen in many place that they show GDDR3 and sometimes DDR3. What is the difference between them?

afaik DDR3 is a type of RAM used for system memory, while GDDR3 is a type of RAM used for graphics cards. So does "G" only stand for Graphics or does it have another particular meaning?

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The actual GDDR3 spec is based off the DDR3 memory specification, but there are indeed changes to make the memory more suitable for a hardware device as opposed to being part of the system memory (e.g. hardware reset capability, increased ability to dissipate heat, as the memory is fixed/soldered and not removable). The Samsung catalog for a surface-mounted GDDR3 module covers a good number of these differences. –  Breakthrough Dec 10 at 1:57
This would have been so easy to google. Wikipedia has extensive articles on both DDR and GDDR, and the GDDR article even tells you right away what the "G" stands for! –  misha256 Dec 10 at 1:58

2 Answers 2

From this

Basically it is a lower power lower heat version of memory based on the DDR2 specification. GDDR3 also features higher bandwidth than traditional DDR2.

so the difference between GDDR3 and DDR3 is that GDDR3 is memory designed for use in graphics cards and is based on DDR2. DDR3 is the successor to DDR2 and is used for computer ram. DDR3 is used with the new intel i7 processors and the AMD Phenom II processors. typically DDR3 has much higher frequencies (around 2000mhz are available now) slightly higher timings of around 7-7-7-20 compared to DDR2's timings of 4-4-4-12. also DDR3 has much higher bandwidth than DDR2 however the increase in actual real world performance is relatively small.

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GDDR or graphics double data rate memory refers to memory specifically designed for use on graphics cards. GDDR is distinct from the more widely known DDR SDRAM types such as DDR3, although they share some technologies - including double data rate design - in common. (http://en.wikipedia.org/wiki/GDDR)

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