QNAP kindly lent us a QM2-2P10G1T drive to test the 10GbE performance of the TS-877. You can see more information on this card on the QNAP site, over HERE.
The QM2 family of add-in cards consists of four models, supporting either SATA or PCIe M.2 SSDs and/or 10GbE networking. The differences between each of them is best summed up by the diagram above taken from QNAP's website.