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 Please note: Different batches, product appearance and color may be different, does not affect the use Type: DDR3 4GBCapacity: 4GFrequency: 1600MHzWorking voltage: 1 5VMemory Channel: Dual ChannelPins:240pinsUnbuffered, Non-ECC, & Non-RegisteredPins of Memory RAMSDDR3 for Desktop=240 pinsDDR3 for Laptop=204 pinsNote: Random color, don' accept the specified color size: 13 3 x 3cmMaterial: PCBcolour: bluePackage Contents:1 x RAM2 x Cooling Vest(Random colors and appearances)2 x Sticker(Random colors and appearances)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