For the video card, I know when it comes to CPUs, Unity is not the best engine for multi-core performance (it actually sucks at it). It may be the same for GPUs as well, although I don't know for certain. Unity 5 is supposedly better at this, but I have no idea if Cyan has any plans to update the engine. My guess would be no.
I would still suggest updating your drivers, and playing with your settings if the framerate really isn't good enough for you.