G4 Sawtooth Up grade from stock CD Drive To Combo

[Hugo Trottier]

Hi all, i have this G4 Sawtooth (I belive to be) 400Mhz. I would love 
for it to be able to play DVD.
I have got my hand on a un needed Combo Drive From Apple to do the 
switch with. Will that be enough
to be able to play DVD or will i also need to replace the Video Card?

Thanks in advance

H.Trottier