Inspiron 5675, motherboard PCIe x16 slots running at x8 speed?

PCI Express PCI-E PCIe 8X to 16X Female Slot Adapter Converter Riser Card for Graphics Card, You can get more details about PCI Express PCI-E PCIe 8X to 16X

It means it's a physical x16 slot and will take any size PCIe card, but it's only wired to x8

pcie x1 in x16 slot Transfer speed: PCIe x16 to x8, 128Gbps Application: PCIe x16 graphics video card to PCIe x8 slot extension cable; Product description: ADT-Link

pcie slot gpu A PCIe or PCI express slot is the point of connection between your PC's “peripheral components” and the motherboard The term “PCIe card” and “