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: ChannelPins:240pinsUnbuffered, Non-ECC, & Non-RegisteredPlease note: Different batches, product appearance and color may be different, does not affect the usecolor:BlueMaterial:PCBsize:13.3 x 3cmPackage Contents:1 x RAM2 x Cooling Vest(Random colors and random appearances, Cannot select specified color and appearance)2 x Sticker(Random colors and random appearances, Cannot select specified color and appearance)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.