CSGO is super easy to run, so there's no issue there. "FPS Games" means nothing. There are hundreds of games out there, so you need to be more specific. You could, however, just look at benchmarks for your APU/GPU to see the performance you should expect.

It's a pretty terrible system with no mention of half the specs. It definitely won't be running any AAA titles at higher than medium settings at 1080p, that's for sure.

We could get a better idea of your hardware if you download Speccy and post a screenshot, since I'm not sure what exact GPU you're using, or if you're running in XFire, or if "R7 Graphics" just means the APU's integrated graphics. It's also likely you have a pretty low quality case, considering that PSU isn't good either.

This will easily run CSGO but you should of done some research before going out and buying a gaming PC

i build this type of pc for testing its igpu and its garbage youll be lucky to even have 60fps with med settings at 1080p in order to have 60+1080p you must play in fullscreen max fps i get in fullscreen 1080p is 75 to 90 at most with everything low cpu is sorta poopy and the igpu is also poopy but hey you can play gta5 at a whooping 40fps csgo at nice frames(only in fullscreen) windowed and windowed fullscreen cause stuttering well aiming