Sonnet 8x4 Silent Gen4 PCIe Card

2 slot functionality, and PCIe interfaces, and the platform's PCIe x2USB USB AudioPCMIUMSSICI2C, SATAPCIe x2SSD E, 1630

2 standard contains variants with up to four PCIe lanes, one SATA 6 Gbs and or one USB port So it is possible to connect PCIe as well as SATA SSDs

m2 pcie slot Current motherboards have multiple slots Some of those slots share PCI lanes with the PCIe slots In the one you mentioned it appears that

m2 slot is a slot that can interface with SATA , PCI Express