Laptop Y570 comes with Nvidia Optimus Technology however when checked on the Nvidia Control Panel, the drop-down box for "Perfered graphics proccessor" is greyed out thus unable to change to Nvidia Optimus. The selected GPU is only the Intel Intergrated graphics.
When checking the system information, the Nvidia 555m is listed in the properties.
In order to enable to Nvidia Optimus Technology, you would need to turn "ON" the switch at the front of the laptop to do so.
Push the switch on the left of the red box to enable Optimus.