Garrys Mod packshot image
Garry's Mod (officially abbreviated to GMod) is a sandbox physics game that allows the player to manipulate objects and experiment with physics using the Source engine. Garry's Mod has been available on Steam's content delivery service since November 29, 2006. rnDespite being a standalone game, Garry's Mod requires the user to own at least one game on Steam based on the Source engine, such as Half-Life 2, Counter-Strike: Source, Portal 2, or Team Fortress 2. It is also commonly used for the creation and publishing of videos on YouTube, mainly from Team Fortress 2, Half-Life 2, Portal and Left 4 Dead.
Garrys Mod GPU Performance Comparison Graph

Garrys Mod GPU Analysis
Comparing Garrys Mod PC system requirements to all GPUs shows that Garrys Mod is going to need a graphics card that is capable of DX 9 or OpenGL 1.5.

Garrys Mod makes use of DX9.00 so a GPU with that capability could benefit from enhanced visuals.

To get the best visual graphical experience on Garrys Mod, aim to have a GPU that has at least 256 MB GPU RAM.

Most bottom end graphics cards currently available today, will probably allow you to play Garrys Mod

We are advised that 15 year old graphics cards should be able to run Garrys Mod , but there could be a few exceptions to this rule.

Note that most games do not officially support laptop graphics cards, but nowadays many laptop graphics solutions are capable of running modern games. Whether desktop graphics cards or laptop, try searching for your graphics card to compare against the Garrys Mod graphics card requirements chart below.