Will PCIe x1 x4 cards work in x16 slot?

Fitting PCIE X4 card in PCIE X1 Slot ardForum x4 slot MediaMemory Card Slot Single Slot: microSDmicroSDHC Built-In Mic Yes Mobile App Compatible Yes x4 slot Two types of PCIe slot on an Asus H81M-K motherboard Various slots on a computer motherboard, from top to bottom: PCI Express x4; PCI Express x16; PCI Express

moon princess slot review PCIe boards can fit into slots designed for their lane configuration or higher Plugging a x4 PCIe into a x16 slot is acceptable