Video card

My friend recently gave me an Nvidia Vanta/Vanta LT video card (16 MB), I currently am only using an intel(R) 82865g graphics controller, which one should I use? the intel is integrated, and i tried to disable that, and use the Nvidia, but i see no difference. I just basically want your opinion on this subject (do i leave the integrated disabled, enable both, or just stay with the intel).
Please and thanks for your help.