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What is PCIe x1 Slot? PCIe x1 slots have only one PCIe lane. Despite having only one PCIe lane, PCIe x1 slots are useful for various lower-power PCIe peripheral cards. PCIe x1 slots are the smallest PCI Express slots with the lowest throughput compared to bigger PCIe slots like the PCIe x16 slots.

Yes, pcie 3.0 x4 speeds or higher are recommended for core 22. You could install Linux, and run any AMD or Nvidia GPU with an equivalent performance of a GTX 1650-1660 into an x1 slot. If you run a GPU with equivalent of RTX 2060 in an x1 slot, even in Linux, you'll experience a performance penalty of well over 15%.