First off if you don't have these 285.79 drivers and if you haven't selected high performance power option in Control Panel\All Control Panel Items\Power Options plus in the 3D setting in the nvidia contro; panel, you're never going to get it running well. As for what's happening to your Y570 I'm guessing that the switchable draphics software stinks and is causing this. I've had two different branded laptop with two different graphics cards and they both didn't work well when running in automatic switch mode, where the laptop choose which card to use for what, lucky the amd card had a way to set the bios so as to stop this automatic switching mode, nvidia hasn't. I won't buy anoher laptop which can't have its switchable graphics mode turn off, I hope doing like I suggested helps.
