I have been able to try the Ti-4200 (Gainward) on a MSI-KT3Ultra kt333 based motherboard with Mandrake8.2 and nvidia 1.0-4191.
This produces the same crash as on the ecsK7S5a SiS735 based board and the Asus Kt333 m'board (a7v333).
There were no irq conflicts for the Ti4200 card.
The Geforce 2 titanium card works fine.
I have a feeling like i do more testing of Nvidia's Linux driver than they are doing.