http://bestgaminglaptopreviews.net/lenovo-ideapad- y510p-review/It also integrates the Intel HD Graphics 4600, which is more graphically powerful than the HD Graphics 4000.
The bad news is that the Optimus technology cannot be activated in this case due to the dual GPUs. That means that a switch cannot be made between the integrated and the dedicated graphics cards.
http://www.zive.cz/clanky/nvidia-optimus-plynule-p repinani-grafiky--video/sc-3-a-151134/default.aspx