I was looking to upgrade my memory from 8gb to 16gb and i made sure before i take my laptop apart that it has 2 memory slots, which the internet, task manager and speccy said i all have 2 memory slots. so i opened up my laptop to see that i only have 1 memory slot, so i did lots of research and apparently my laptop ( Acer Aspire A315-22 ) has 2 ram slots but mine didn't so i took the only ram stick out that was visible. i go onto task manager to see that i have 4gb ram still in there even when i took out the other 4gb. so my question is, how do i only have 1 ram slot that is visible but when i take it out i have 4gb of ram instead of 8gb. Help?!