Stretch

Hello everyone, I have a problem with multiple games (World War Z, Modern Warfare). As you can see from this video (not mine but this is what it looks like) there seems to be some pixel stretching happening. I tried underclocking but the problem still persist. I think it's not a problem of...

Soon I'm going to order all the parts for my rig. Need to quickly make sure if everything will be fine with my gaming rig. This will be my first ever build. Im trying to play games like days, arma3, subnautica, h1z1, rust, arc, and more things like that. Need to know if my pc is good enough and...