PCIe x16 GPU card into a PCIe x8 slot?

CPU PCIe is built to support gaming from the ground up with up to 16 CPU PCIe lanes and up to four CPU PCIe lanes is

The Matrox PCI and PCIe technology guide explores the importance of evaluating different slot types when buying add-in graphics cards

pcie 4 m2 in pcie 3 slot In ASUS 「PCIe x16 Slots - 4」 - Motherboards Components , you out of 5 stars Intel LGA 1151 ATX motherboard with AI Overclocking, quad-GPU

pcie 40 gpu in 30 slot In ASUS 「PCIe x16 Slots - 4」 - Motherboards Components , you out of 5 stars Intel LGA 1151 ATX motherboard with AI Overclocking, quad-GPU