The 890FX has no onboard GPU, it is intended for 16/16 crossfire. The 465 will run fine, but you cant do nVidia's 3D surround with a single card, you need two nVidia cards to support 3 monitors and you cannot run nVidia cards in SLI on an AMD board so you are wasting the potential of the board. If you want to do full nVidia 3D surround your only choice is to go with an intel build or one of the few AMD boards with an nVidia chipset.
I dont consider modded drivers proper usage of designed features on a board. You can make a system do almost anything it wasnt designed for if you spend long enough modding drivers, but this is not something that you should set out to do with a new build, its a sign of poor planning.