My uncle installed the RAM today for me. I cannot even explain how great just an extra 4GB is. The difference when I'm playing games now vs before I added the RAM is incredible. My uncle showed me how to see how much RAM I was using while playing a game, so I tested it with a few of the games I play.
I played vanilla Minecraft on my normal settings (fast graphics, 12 render distance), and found out I was using 4GB while playing the game, that's all the RAM I had before. Now that I have 8GB RAM, I can probably play Minecraft on fancy graphics!
I tested my heavily modded version of Minecraft, and the lack of RAM I had before explains why my modded version would constantly lag and freeze. With all the mods I have installed, it takes 7GB to run! Now it runs so, so much smoother and hasn't frozen or lagged once.
I was actually able to PLAY Planet Coaster, no joke. Before I was barely able to play it for a few minutes before it'd freeze and lag like crazy. Found out with 1,800 guests in my park it takes 6.5-7 GB.
Crazy, I had no idea these games actually needed that much RAM! I can say it certainly does make a difference to upgrade RAM. If you are considering purchasing RAM because your games are laggy, freezing, or slow, I would recommend it! Even just an extra 4GB helps!