From console to superior: I HAVE JOINED PC MASTER RACE

[Ganoncrotch]

From what I see in a tear down of the PC btw

https://www.amazon.com/MSI-Skylake-Motherboard-B150M-Bazooka/dp/B016AT9F5A/ref=as_li_ss_tl?ie=UTF8&linkCode=sl1&tag=legirevi03-20&linkId=e6ace2281d3b0d41f7a212a372521f74

That is the motherboard found in some of those, which supports up to 64GB of RAM in 4 slots and it would almost certainly have 2 of the four slots populated with memory, what you would want to be buying is

https://www.amazon.com/Kingston-2133MHz-Non-ECC-Desktop-HX421C14FBK2/dp/B00TY6A1P0/ref=sr_1_2?s=pc&ie=UTF8&qid=1477446232&sr=1-2&keywords=ddr4+2133
Which would fill the other 2 slots with 2x4GB and bring you up to 16GB or else

https://www.amazon.com/Corsair-Vengeance-2133MHz-PC4-17000-Memory/dp/B0123ZCD36/ref=sr_1_1?s=pc&ie=UTF8&qid=1477446232&sr=1-1&keywords=ddr4+2133

Which would add 16GB to your machine, since you haven't much exp with PC's it's perfectly fine to have the 2x4 in there right now (I really doubt they would have used 4x2GB sticks) and to have a set of 2X8GB just make sure you put the 2 new ones in the matching color slots, so you have 2 white and 2 black slots for ram, 2x4 in the white and 2x8 in the black, don't mix that up.

If you're unsure of where they go

It's the black and white long connections on the bottom right of this picture, (this is the board which I think is in your machine) so you can check by opening the side panel and checking to make sure you have 2 of these empty, and then buy some ram and fill it up!

Any questions at all, if you ask on here or PM me there is a load of tech support people on this site (I'm certified!)