Will PCIe x1 x4 cards work in x16 slot?

Will PCIe x1 x4 cards work in x16 slot? pcie x1 in x16 slot Install a PCI Express x16 Card into a PCI Express x1 slot, in a 1U chassis · Designed to fit most 1U server chassis' · Complete pass through design supports the pcie 40 in 30 slot So, to answer your original question, if you're happy to abandon any other PCI devices you currently have, you can choose a motherboard with more PCIe x1 slots;

pcie 40 in 30 slot PCI Express X1 to X16 Low Profile Slot Extension Adapter - PCIe x1 to x16 Adapter - PCIe x1 to PCIe x16 slot adapter

pcie slot length The PCIe x1 slot is the smallest PCI Express slot and has the lowest throughput compared to larger PCIe slots such as the PCIe x16 slot  Intel no longer supports PCIe x1 controller cards plugged into PCIe x16 slots starting from the Alder Lake desktop PCs, which are HP G9 platforms