The collected works of psychicist

I have bought a Sun Enterprise 250 mainly to run and compile Linux software but I have enough drives to install all kinds of operating systems such as Solaris and BSDs. It includes a Tech Source GFX 8P graphics adapter but I would like to try a Radeon 7000 or 9250 PCI which I have kept around for this kind of purpose.

Is there a way to get one of these cards up and running as the main adapter instead of the old and slow GFX 8P, which is not very well supported on Linux? If this is possible I intend to buy several more Ultra workstations.