Resolved* PCIE x16 slot stuck at x1 mode while gaming

I tested PCIe x4 10Gbe NIC in a PCIe x1 slot, and here's my thoughts and results

1) First is simply looking at the motherboard, many times printed on the PCB near the PCIE slot is the actual X4 or X16 or whatever it happens

x16pciexp slot The width of a PCIe connector is mm, while the height is mm, and the length is variable The 'minor' half of the connector is mm

x16 slot Gniazdo x1 ma 18 pinów z każdej strony, gniazdo x4 – 32, gniazdo x8