10GbE NIC in PCIe x1 , Will this cause problem?

The slot format used by both PCI Express and PCI Express is the x16 PCIe slot However, PCI Express slots are subjected to

PCIe x16: This is the largest PCIe slot with 16 data lanes PCIe x16 slots PCIe : Released: 2007; Max Bandwidth per Lane: 500 MBs; Max Bandwidth

pcie x16 expansion slot To successfully install and run Intel Arc Graphics, it is necessary to have a full-size PCI Express x16 slot The Intel ARC A750

pcie slot length Is this also true of all other devices like this? I was assuming they could all reach the 1000mbs that the pcie slot could reach (plus reviews