Each memory through the types of manual testing, make the product can used in different application environments,be to users with both high-performance and high stability of the computer experience.Whether it is general , gamers, or computer enthusiasts, can feel memory bring the performance improvement for computer/flash memory vendors are using decimal arithmetic: 1MB=1000KB, 1G=1000MB , the is using binary arithmetic: 1MB=1024KB, 1GB=1024MB. So there are some differences between display capacity and nominal capacity of /flash memory products. However, this is allowed to exist. do not doubt his authenticity.Specification:Type: DDR3Capacity: 4GFrequency: 1600MHzWorking voltage: 1.5VMemory Channel: Dual ChannelPins:240pinsUnbuffered, Non-ECC, & Non-RegisteredColour: blueMaterial: PCBSize: 13.3x3cmPackage Contents:1 * DDR3 4GB Desktop Memory RamOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.