Matej Pospisil :
What is the maximum overclocking without my system failing? I have 350 W PS.
This bit is somewhat worrisome. 350W doesn't exactly leave a lot of headroom for anything.
Maximum OC depends on a lot of factors though. Each GPU is going to be different from one another, so your OC will be different from most other OCs. your 1050ti, however, is factory overclocked. so you're already running a stable OC. More than that I can't say. We would need more details about your set up. Specifically, what is your power supply model, and motherboard?