[Mike Bulda]

Leopard wasn’t suppose install on a G4 dual 800 either, but I installed it by doing a firmware hack that I found on Lowend Mac, https://lowendmac.com/osx/leopard/openfirmware.html

And with an upgraded video card and maxed out ram, Leopard runs fine on my Dual 800.

I think you could use the same process to load FC6 onto your dual 800. Rendering HD and FX effect might be super slow… but the program should load.