All diffrent gamemodes uses up diffrent amount of RAM aswell as CPU Usage. And as far as I know, SRCDS is not multi-threading. Which means that it only uses 1 core. My DarkRP server uses up a total of 1.5 GB RAM aswell as 99% CPU usage on 1 core when the server has 24/24 players on it.
I’m not sure on the Monthly Bandwidth though…
For the HDD Space 50 GB is enough, since SRCDS by default takes 6 GB.
TTT gamemode uses around 40-60% on one core with 24 slots. It doesn’t even use up 1 GB of RAM.
What you should be aware of is that you have to put each SRCDS process (each server) on diffrent cores. If you are using Windows you can do that through the Task Manager. I dont know about Linux.
You’ll probably be able to have 1 DarkRP server and 1 TTT server on that VPS.
But as I said, it depends on what gamemode you want to use.
One more thing though, do you have access through Remote Desktop Control or SSH (Secure Shell Access)?
I dont know anything about SSH yet.