It's self-upgradable if you're brave! But even a configuration like this won't eliminate fans. The water-cooler on the GPU block still runs through a radiator

It's self-upgradable if you're brave! But even a configuration like this won't eliminate fans. The water-cooler on the GPU block still runs through a radiator circuit that is fan-cooled and shared with the CPU. Replacing the 400-odd watts of heat that system dissipates under load is extremely difficult with a passive system. You'd have to end up undervolting the components for stability's sake, at which point selecting such a powerful system starts to make less sense.