There's more to it than only certifying whats sent to them, I can certify cards... I have the program and routines for doing so but without breaking NDA it's difficult to explain why GeForce cards are not on an official list... I suppose I can say the should be on the list, but they're not because of "reasons".
Needless to say, Autodesk *DO SUPPORT* GeForce cards... they just can't add them to a certified hardware list. The confusion is immense, they know it, it's just one of those not-very-big-on-the-priority list that nobody wants to take ownership of and deal with.
So yes, get a GeForce card, you'll get absolutely no benefit from a Quadro card for Inventor.
Just note there are diminishing returns above a 1060, I have a 1070 and a 1080Ti and there's zero difference between the two for Inventor.
@mdavis22569 what's your high score again? I pulled a 13.2 with a stock 8700K, with an overclock I reckon I could peak 15!