By cons, where it does most is at the frame rate.
My Radeon HD5850, is no longer young but still lets me play the games correctly the moment (at least until now).
But for AC unity is unmanageable. With minimum settings (after all it's still very nice let us understand) I have an uneasy feeling ... And the cutscenes you forget, it's completely jerky.
Verdict:
I think I'll set it aside for a few weeks until (hopefully) fix a patch and gently think to buy computer equipment ... but for now it's not possible, I have no budget.