Last summer I got a new gaming PC and it was working pretty good until it started crashing with visual artefacts when playing. Last month I asked the guy who build the Pc if I could give the bad card for a new one and he said ''yes, but I will test it first to see if the graphics card is the problem and not something else". After 2 weeks(I was gone) he said that the graphics card is good and put windows 10 on my pc(I had windows 7)because he thought that this was the problem . I know that the graphics card is bad because what could make so many artefacts but I don't know how to change it for a new one or if I even can. Do I need the original box or something(he gave me just the pc). And if I can't change it can you guys recommend a pretty good graphics card for a good price(in my country this graphics card cost about 224€ (I live in Romania) and I would also want Nvidia because I heard that it doesn't crash.