The Dell PowerEdge R640 Server is configured to accept these 400GB SATA 6G Mixed-Use 3.5 SSD Hybrid w/X7K8W Tray, Hot-Plug Drives.
These Drives are interchangeable in the Dell PowerEdge R640 Server and are compatible with one another.
They are Genuine Dell Drives with Dell Firmware and Serial Numbers designed specifically for your Dell PowerEdge R640.