What is a PCIe slot with an x4 slot and x16 connector?

what can you do with a PCI Express x4 slot? x4 slot * The PCIEX4 slot shares bandwidth with the M2P connector The PCIEX4 slot operates at up to x2 mode when a PCIe SSD is installed in the M2P x4d slot It's a slot of x16 size but electrically x4 This

1_24 scale slot cars I do have some doubts though on power draw requirements over x4 PCIe since A2000 doesn't