So i was doing some testing. Comparing the ATI Radeon HD 2600 xt to an HD 5450, everything went well and the results showed atleast 10 fps more in almost all games on the 2600 xt which i had prior to swapping so i put it in there and turned on my pc. Everything is 100% fine. I wanted to play some FNV so i turned it on and it launches and when i get into a game i can see the mountians in the distance have missing (triangle mostly shaped) textures, which are transparent (the game also crashes after 5 seconds). So i go into warface, same. Same in tf2. In games like fortnite nothing but i'm super scared right now. I have no idea whats going on and why is it going on. So if anybody has any idea how to fix it id be more than happy to hear it.