High end server PSUs also have liquid cooling now. I'm not quite sure of what temp ranges they run in though.
Apparently SuperMicro also has an existing solution. They are stating very similar numbers: https://www.supermicro.com/en/solutions/liquid-cooling
alt Hacker News
Apparently SuperMicro also has an existing solution. They are stating very similar numbers: https://www.supermicro.com/en/solutions/liquid-cooling