You're gonna have no problem with either game

Just remember to specify that you wanna run them through the dedicated video card, it might default to the integrated one for some reason.
As for the games, I think they're both great but Dark Souls is easily superior to the sequel. Matter of fact, it doesn't really feel like a sequel to me, more like a different take on the same formula. It does bring about some improvements (streamlined weapon upgrade system, covenants, ...) but it lacks the sheer brilliance in level design of the first game and sometimes it feels like encounters are designed to be difficult rather than interesting (focus on ambushes and multiple enemies fights, while the first game, with some exceptions, emphasized 1vs1 fights, which is where the combat system really shines), while I never got that impression playing the first game. So yeah I'd definitely suggest the first one.