Mixing memory is typically a bad idea as it may not be stable or even boot. If you want to increase your memory I'd sell your current kit and buy a 2x8gb kit.It is always annoying to play rust with my pc because of fps drops. I got 60 fps but usually drops for like 3 in crucial moments. Should I consider upgrading my ram into 12 gb?
2x 4gb ram
It may help, you will want to monitor your CPU/GPU & memory usage while gaming and note what they are during those dips and do this before buying anything as it may be something else causing that issue.Ok thanks. Can that help the game?