So I bought a Leadtek GTX560 2GB back in 2011, replacing a Leadtek GTS250 1GB.
Now last Thursday I suddenly got some artifacts just when I entered GTA5. Restarted PC and game, problem went away.
Friday had no issues.
Saturday, from the first PC startup, the problem came back... this time I couldn't get rid of it after a dozen restarts,
and there were artifacts in Windows itself.
Is there something physically wrong with it? I cannot afford a new one (GTX960), and the GTS250 sucks.