what would happen if there were too many things cause im going to add lots of weopons and stuff.
Let's just assume some things here:
No matter how good your GPU is, you will lag seriously hard. But, it won't explode.
Your CPU would have to work harder than it usually does to handle such an event. This could result in thermal throttling.
If you don't have a solid state drive but instead one of those molasses-slow mechanical drives your computer will be sent to its own personal hell.
If you have Windows as your OS, your computer will BSoD. If you have a Mac, your computer could go into Kernel Panic.
PLEASE don't try it. Your computer will be doomed.