/flash memory vendors are using decimal arithmetic: 1MB=1000KB, 1G=1000MB calculated, but 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. Please do not doubt his authenticity. Type: DDR3 Capacity: 4G Frequency: 1600MHz Working voltage: 1.5V Memory Channel: Dual Channel Pins:240pins Unbuffered, Non-ECC & Non-Registered Please note: Different batches, product appearance and color may be different, does not affect the use color:Blue Material:PCB size:13.3 x 3cm Package Contents: 1 x RAM 2 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.