Storage Upgrade - Pavilion 27-xa0014 All-in-One

That particular motherboard has two M.2 slots but one is used for a WiFi card; the other is for PCIe NVMe storage, so it won’t take SATA-based drive.
 
Yes, the maximum memory supported isnt clear - the motherboard chipset supports 16GB per SODIMM slot, so in theory, it should take 32GB. However, it’s possible that HP have limited to 16GB for compatibility reasons. I would think that amount of RAM is enough for most situations applicable to that computer, though.
 
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