Z690 PCIe slot question

What exactly does the spec “PCIe x16 slot ” mean? pcle slot x121e has the slot for mSATA SSD, it's a combo slot for a WWAN card either, not a one, 2242 or anyone else The latter can't be fitted in pcle x16 slot If you have the option of multiple slots where at least one supports PCIe, it's worth considering your secondary slot for an SSD upgrade When combined

pcle slot PCIe slot mapping from compute sleds · Four-bay chassis—Each half-width compute sled is mapped to two PCIe slots · Eight-bay chassis—Each quarter-width compute