I wouldn't trust those Can you run it sites. I checked one out a while back for curiousity and it wanted me to install some java thing, I instantly changed pages. They also base whether or not you can run with the official minimum and recommended specs from NCsoft which totally suck. If you were to play on the minimum specs, you'd probably get 5 fps max, maybe 15fps for recommended specs.
Unless NCsoft recommends you to play at crappy settings, I wouldn't go by that.