PCIe 16x card in a PCIe 4x slot?

Can I be 100% certain that a PCIe x4 card will fit in a PCIe x16 slot? can you put pcie 4x in 16x slot It's worth mentioning that all PCIe card versions are backward compatible That is to say, any version of the PCIe card and motherboard can work candy mix slot On the specifications it says it has 2x 16x PCIE slots however when I go on the manufacturer website it says it has 1x PCIE 16x slot and one PCIE 4x slot I don

can i use pcie 40 in 50 slot Here is AMD's Crossfire compatibility chart to help you understand which cards will work together in crossfire and yes x16 and x4 will work fine