Acer aspire a315-51 RAM confusion!?!

[hunjra12345]

hello people of the internet, this is my first post and i hope to get some help.

my problem is that my laptop says that it has 2 slots and people online have said one is soldered and the other is an extra empty slot, and i thought this was true because i checked on cruciual and it says that i have one soldered and one extra. so i opened up the ram slot on the back of my laptop which is supposed to be empty but instead had 4gb ram in it! my laptop only has 4gb ram so that means the other slot should be empty but i cant seem to find it...
Please if anyone could help me id really apreciate it!

 

[algorithmbreaker]

Acer Aspire 3 A315-51 Laptop supports up to 12GB. It comes with a 4GB soldered to the board itself, there won't be the slot. The other slot will be visible and upgradable. The upgradable slot can have a 4GB or 8GB.

Refer this for the compatible spec

https://www.memorystock.com/memory/AcerAspire3A31551.html