i have GTX 1050ti, when i put csgo at low setting 640, random black screen appears. this hapns only in csgo and that to in 640 resolution setting...
Are you having to shut the PC down manually via power switch on the PSU?
Have you monitored your GPU usage during the game?
Im checking to see if your running into the same issue i'm having with my PC, I have another post going but no reply's.
And yes having a converter does limit your resolution depending on the actual cord used..