Hi,
You can find that information with programs like CPU-z or HWINFo64. You can view the amount of RAM installed in Slot1 in SPD tab, if it's 8GB, most probably soldered and one slot available for upgrade, in that case get another matching 8GB stick. You may have to do a complete disassembly to access the memory slot but I am not sure, there'e picture of MB in this link, it might be helpful:http://www.notebookcheck.net/Acer-Aspire-R13-R7-372T-Convertible-Review.158791.0.html
