well, I can't. There are only so many cards available in our country, and I was told this one works with Linux. But, only after purchasing it I see that the drivers are too old for CentOS4.6. The shop won't take it back, since the package has been torn open already.
The machine runs on a Socket 478, so replacing the motherboard means replacing the CPU & RAM as well. Bottom line is, I can't justify the costs of replacing everything related to get a supported motherboard.