what is gddr
1.DDR3 is a type of RAM used for system memory while GDDR3 is a type of RAM used for graphics cards. 2.GDDR3 memory is much faster than DDR3 memory. 3.GDDR3 memory is more expensive than DDR3 memory. 4.GDDR3 memory addresses can be read and written at once while DDR3 memory addresses cannot.