You say you tried to use FX3 and it detects your intergrated intel card. DID FX3 work?
I'm going to assume your computer came with both cards when you purchased it. If this was the case it should detect your intel card and use your NVIDA card to boost performance and swaps between them to save power. If you check bench marks and other things on the two cards you will see they are almose totally equal. I don't believe you will gain anything by trying to use just one card as you computer was made for using two when needed. If you wish to disable the intel card go ahead but your screen may go black as it is the one first in line on your motherboard. What else you can check is in the Device Mgr is to make sure you NVIDA card is listed as enabled. If so it was made to work as I said.
This is done almost always in Laptops only.
