Each memory through the various types of manual testing, make the product can used in different application environments,be able to provide users with both high-per suitable formance and high stability of the computer experience. Whether it is general user, gamers, or computer enthusiasts, can feel memory bring the per suitable formance improvement suitable for computer Hard disk/flash memory vendors are using decimal arithmetic: 1MB=1000KB, 1G=1000MB calculated, but the operating system is using binary arithmetic: 1MB=1024KB, 1GB=1024MB. So there are some differences between display capacity and nominal capacity of hard disk/flash memory products. However, this is allowed to exist. Please do not doubt his authenticity. Specification: Type: DDR3 Capacity: 4G Frequency: 1600MHz Working voltage: 1.5V Memory Channel: Channel Pins:240pins Unbuffered, Non-ECC, & Non-Registered Colour: blue Material: PCB Size: 13.3x3cm Package Contents: 1 * DDR3 4GB Desktop Memory Ram Only 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.