Technically, it's fanless. Enermax showcases a mind-blowing computer at COMPUTEX TAIPEI, totally immersed in non-conductive mineral oil. This beast of a machine features a 350W AMD Ryzen Threadripper PRO 7000 CPU and can also handle four high-end GPUs. It's not practical at all, but does look like something out of a steampunk movie. Update: According to Tom's Hardware, this $50,000 system utilizes a two-phase liquid coolant, which can be described as a solvent.
Source: TechPowerUp