What is the difference between a PCIe x1, x4, and x16 slot

Perhaps use open-ended PCIe x1 slots instead of PCIe x16 slots? #9 x1 pcie slot 1 PCIe x16, 1 PCIe x16, 1 PCIe x1, 1 Key E for WiFi - 1 x PCI Express x1 Slot - Supports AMD Quad CrossFireX™ and CrossFireX x16pciexp 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;

x16 slot Every PCIe slot supports its own number of CPU lanes X16 has 16 Lanes support, X8 has 8 Lanes support, X4 has 4 lanes support and x1 has