DDR3
Short for double data rate, type three, DDR3 is the successor of DDR and DDR2 memory and is a type of memory (RAM) for a computer. DDR3 has bus clock speed of 400 MHz up to 1066 MHz, and memory chips range in size from 1 GB to 24 GB. DDR 3 memory chips are nearly 30% more efficient in power usage than its predecessor, having a 1.5V supply voltage (DDR2 - 1.8V). The first motherboards to support DDR3 memory began showing up on the market in June 2007. DDR3 SDRAM is the most current type of memory used in the majority of computers systems around the world.
DDR3 memory chips can only be used in a motherboard that supports DDR3 memory. It is not backward compatible with DDR2 memory slots. It provides 30% reduced power consumption over DDR2, as well as improved performance and speeds.
Also see: DDR, DDR2, Memory, Memory definitions