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

What is a PCIe slot with an x4 slot and x16 connector? x4 slot Storage options are plentiful as well, with dual 2280 slots One slot utilizes a PCIe x4 interface for blazing-fast storage speeds, x4 slot I do have some doubts though on power draw requirements over x4 PCIe since A2000 doesn't

x4 slot PCI Express PCIe x4 slot

american slot There are dual PCle SSD slots, supporting up to 4TB fast internal storage The PCle x4 slot is also compatible with an SATA III SSD  * 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