DDR3 stands for double-data-rate three and is a random access memory technology used for high speed storage of the working data of a computer or other digital electronic device. DDR3 is part of the SDRAM (synchronous dynamic random access memory) family of technologies and is one of the many DRAM (dynamic random access memory) implementations. DDR3 SDRAM is an improvement over its predecessor, DDR2.

The primary benefit of DDR3 is the ability to transfer data for I/O at 8 times the speed of its memory cells, thereby enabling faster bus speeds and higher peak throughput than earlier DRAM memory technologies. However, there is no corresponding reduction in latency, which is therefore proportionately higher. In addition, the DDR3 standard allows for chip capacities of 512Mb to 8 Gb, effectively enabling a maximum memory module size of 16 GB.

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DDR2

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DDR2

DDR3

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DDR3
Voltage 1.8 Volts 1.5 Volts
Speed 400 MHz, 533 MHz, 667 MHz, 800 MHz, 1066MT/s 800 Mhz, 1066 Mhz, 1330 Mhz, 1600 Mhz
Modules 240-pin DIMM unbuffered registered; 200-pin SODIMM; 214-pin MicroDIMM 240-pin DIMM (same size as DDR2 but are electrically incompatible with DDR2 DIMMs and have a different key notch location). DDR3 SO-DIMMs have 204 pins.
Prefetch Buffer 4 bits 8 bits

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Modules of DDR2 and DDR3 RAM
Modules of DDR2 and DDR3 RAM

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Graphics cards need fast data transfer between framebuffers. So the higher bandwidth capabilities of DDR3 are useful.

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"DDR2 vs DDR3." Diffen.com. Diffen LLC, n.d. Web. 29 Jun 2015. < >