Will PCIe x1 x4 cards work in x16 slot?

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

Will PCIe x1 x4 cards work in x16 slot? I found things online like riser cards that seem to take one 16x lane and split them into 2 8x lanes, or 4 4x lanes, etc My thinking was if I

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

4x4 mega slot PCIe Slots PCI Express replaced AGP and PCI as it is faster than PCI Express 4x, 1600 MBs PCI Express 8x, 3200 MBs PCI Express 16x, 6400 MBs

My first motherboard runs the 3x full size slots in a PCIE 4x configuration, with the single slot at 1x configuration How can I change

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Putting this card into 4x slot will probably limit it to about 6-7Gbits PCIE HBA and PCIE GbE Card in single x8 Slot using splitter