PCIe x16 GPU card into a PCIe x8 slot?

FWIW the x8 vs x16 shouldn't make any performance difference with that card since your system is running it in PCIe and it doesn't need the

It should work According to the picture of your Motherboard, you should have 2 16xPCIE and one 4xPCIE slots available Have you tried in all

mage best in slot PCIe x16 Gen expansion backplane with two slots The PCIe x16 Gen3 backplane has two PCI Express x16 slots, with one slot supporting the OSS target

quick spin slot machine ‌PCIe X16 Golden Edge to PCIe X16 Slot Adapter Features : PCIe x16 card edge PCIe x16 slot PCIe Gen 3 16 lanes signals of PCIe designated 4 Layer PCB