9211-8i card in PCIE x16 slot but operates at x4, would this

This video explains everything you need to know about PCIe slots, including PCIe slot

As long as the card physically fits in the slot it should work, PCIe is supposed to negotiate the best link over whatever number of lanes are

can i put pcie x4 in x16 slot It will only take up one x16 PCIe slot and thereby only use 16 of the 60 availible lanes from the Threadripper CPU But it will take up two

canadian slot machines It means, you'll be able to plug in any x16 add-in-card but that card will only ever be able to run at x8 PCIe bandwidth on that bottom