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To be perfectly honest Loque looking at your first screenshot would not typically make me think it could be a faulty cable, but i guess you learn something new everyday. At least you know your card is not faulty though.
It started off as just tiny flickers of corruption like that, but after a couple of days it got to the point where my screen would completely flicker off and on whenever I was at the main menu of the game. As soon as I got into a game, it would stop, which was weird...
Using the new cable I just got (in one of the ports that it actually works in) I've not had a single flicker all day, so it seems to have solved the issue.