Hello,
Hehe Sorry it's not Garry's Mod. It's more like a graphics card problem. :)
Check your Drivers and heat of your graphic card please.
Before you think that the graphics card is dead.
EDIT:
if the heat if very hot, add this command "fps_max 30" in:
C:\Program Files (x86)\Steam\steamapps\common\GarrysMod\garrysmod\cfg\autoexec.cfg
On Gmod I have 300fps this is useless, This is perfect for wear of the graphic card. Lock in 30fps max with this command. I save 50°C.
Last edited by Nordahl on Sun 31 Jan - 5:35; edited 2 times in total