If its a PCI-X G5, fast. Run a little hot but its not too bad if your house is cold inside.

I would not dump more than 150 dollars into it if you got it for nearly free. They all have a defect when running 10.4 where they make faint chirping sounds.

An Intel Mac of early age would serve better for the purpose, it is poor at multimedia now. (But still better than a G4)