GPU Running with PCIe x8 instead of x16 help

pcie x 16 slot   Dan pcie 4 m2 in pcie 3 slot

I thought PCIe was superceding PCIX But I have 2 PCIe x 1 slots on my motherboard, 3 ordinary PCI slots and one which is

PCIe Gen3 X4 , and PCIe X16 Slot Armor Jakarta, Indonesia - May 31, 2019: Intel Z390 UD Motherboard with 10+ malaysia, april 20, 2020 close-up pcie x16 Specifications x 1

locker elektronisch slot PCIe x16 is your 16-lane PCI Express slot, or at least your largestlongest PCI Express slot It is the most high-bandwidth, high-performance expansion slot PCIe * Hardware Design 1 PCIe Slot PCIe x16 slot with faster bandwidth and lower impedance 2 PCIe Slot PCIe x4 slot with Lower