what are m.2 slots
Checking SSD Compatibility with Your Motherboard
Important features for a new "normal" consumer board these days are M.2 slots for PCIe storage because inferior 2.5"/SATA drives are now more expensive than superior M.2 NVMe drives.
M.2 expansion slots: what is socket 1, Key A and how many sl... ...
M.2 expansion slots: what is socket 1, Key A and how many slots are available of M.2 drives in total.
Will upgrading your computer's RAM boost its speed?
ASUS F555LN, no M.2 slots ; Asus F555UB, no M.2 slots ; ASUS FX502, M.2 PCIe NVMe SSD slot (2280) ; ASUS FX503, 1x 2280 PCIe NVMe M.2 slot.