In order to suggest any upgrades, you're asked to stylize your post like so;
How to Ask for New Build or Upgrade Advice First off, respect where respect is due - this is an adaptation of the Animal's *How To Ask For New Build Advice* Sticky. I created this because there's a lot of posts nowadays asking for upgrade advice both on here and on the CPU forums, and I feel...
forums.tomshardware.com
Atop of that this thread, might have tried to solve the issue;
When I'm playing GMOD my gpu utilization is usually around 40%, and cpu 20%. I'm usually getting around 200-300 fps that's great, but there's a problem. The moment I start to spawn props and dupes My gpu utilization drops from 40% to 10% and even lower if there are enough props. This makes no...
forums.tomshardware.com
but IMHO, you didn't list your full system's specs. Does the issue crop up with only that one game or other titles?
To add, what are you taxing the system with anyways? I'm assuming off of that thread that the system is taxed with that one game.