Are my PCIe x1 slots PCIe or ?

Are my PCIe x1 slots PCIe or ? x1 pcie slot NICs work well in x1 slots, especially the single-port 1G or dual-port 1G Quad-port 1G won't be able to fully saturate all 4 ports at the x1 pcie slot Hi everyone, I want to upgrade my custom build TrueNAS to 10GbE However, I find that the motherboard only remain a PCIe x1 (in x16

x1 pcie slot 1 additional PCI-Express x1 slot is needed

x16 slot This is a general trend in the industry, same thing with SATA, for example PCIe x1 means just one serial channel, while PICe x16 has 16 serial channels, and Maybe you have a hair or something else blocking a contact in your PCIe slot Or a bent socket pin Or a defective motherboard Or a defective