I can translate to you from russian:
RivaTuner "Quadro Patch" not support FX series card, because new driver use new protection, but utility creator not research it at now moment (and no in future, I dont know why)
Its only work maximum on Geforce4...
But one man on nvworld.ru forum say, what use quadro patch on 45.21 (if not forget), another say what FX5800 can work with patch... may be its kidding...
I try use FX5200 and FX5700 (on some new drivers) - but its not work.
I know use FX card and Gelato create some not big artefact (with shadow etc.)
(but I not using themselves Gelato yet)