Description 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.Type: DDR3Capacity: 4GFrequency: 1600MHzWorking voltage: 1.5VMemory Channel: Dual ChannelPins:240pinsUnbuffered, Non-ECC, Non-RegisteredPins of Memory RAMSDDR3 for Desktop=240 pinsDDR3 for Laptop=204 pinsPlease note: Different batches, product appearance and color may be different, does not affect the color:BlueMaterial:PCBsize:13.3 x 3cmPackage Contents:1 x RAMOnly the above package content, other products are not included.Note: Light and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is 1-3cm. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.