I have an Asus K73SV notebook with an intel core i5 2410M 2.3GHz with Turbo boost up to 2.9 GHz and an NVIDIA GeForce GT 540M. So I was wondering if this motherboard is compatible with the Geforce GTX series from NVIDIA? If not, what is the best graphics card I can get?
the 540m is the best one you can get, because it is soldered into your motherboard.
This is why most gamers eventually move to a desktop as you can upgrade piece by piece as a laptop pretty much only ram you can upgrade.