I'm a 'Macs-a-plenty' owner and user myself, and i agree that those G5s are trully powerful machines still. But i would never feel safe on a liquid-cooled machine, in fear of it ever leaking. Maybe there's some sort of preventive maintenance that needs to be carried out every now and then, but i'd rather stay on the dry side. Looking at the pics, it reminds me of the duplex-strainer gear we had that was part of the heating and cooling system of ammunitions storage we had aboard some vessels. Not the best of memories..

icard