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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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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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