Judging by the website of the manufacturer of the Mat Board, the connector can operate at speeds of pci-e 2.0 x2. Yes nascosti of the order of 1.0 GB/s
Quote from the website of the motherboard
Intel® H310 Chipset :
1 x M. 2 Socket 3, , with M Key, type 2242/2260/2280 storage devices support (both SATA & PCIE x2 mode)*1
The fact that under svesu=daughter...
Due to the Chipset limitation, when an M. 2 device is installed in PCIe mode, the socket is set to PCIe 2.0.