The Crucial CT25664AC667 is a DDR2 RAM that boosts the processing speed of your desktop computer. With a memory of 2 GB, this Crucial RAM module allows for multiple applications to run concurrently without any glitches. This DDR2 RAM has a memory speed of 667 MHz and consumes less power, which makes it suitable for mobile systems. The Crucial CT25664AC667 is an unbuffered RAM that performs faster than a registered RAM. If you are looking for a RAM that delivers decent performance, this Crucial RAM module will certainly meet with your requirement.