rx 550 recognizing pcie x16 slot as x8

It's a slot of x16 size but electrically x4 This

Hi, i have a tiny question on PCIe lanes My Mobo has 2 PCIe x16 slots The manual says that both of these ports operare in x16 modes,

pcle x16 slot The 'x16′ indicates the maximum number of PCI Express lanes supported and thus, the length of the slot As version , each lane provides

pcle slot slots with heatsinks,PCIe x16 SafeSlot with Q-Release,WiFi 7,USB 20Gbps rear IO port and front-panel 22800 ROG STRIX Z790-F GAMING WIFI II