Why would a PCIe x16 slot be limited to PCIe x1 card?

Yes PCIe Express connectors are designed so that a larger slot can accommodate a smaller card So, a x4 slot can handle x4, x2, and x1 cards

Yes, it works just fine, obviously it's only work at x4 speed I would check whether the x16 slot can handle the power load of the

canada slot I did contact the card manufacturer, and they said that putting a x4 card in x16 slot is called up-pluging, and they know for sure that these

can you run pcie 40 in 30 slot PCIe x16: This is the largest PCIe slot with 16 data lanes PCIe x16 You can find these platforms in the FG2 rugged servers and are available today