Sure but notably car water cooling, as robust as it is, does eventually spring leaks. I think it's a question of whether the efficiency tradeoff is worth the m

Sure but notably car water cooling, as robust as it is, does eventually spring leaks. I think it's a question of whether the efficiency tradeoff is worth the maintenance tradeoff (which we probably won't know since there's not a ton of these kinds of solutions in use). With air cooling it's easier since the entire medium around the servers is the fluid. With liquid cooling, short of doing a bath setup (which doesn't appear to be what's proposed here) I'm not convinced it's going to work well; Just imagine 2-4 pipes running to every 2U server on a rack. IMO, we shouldn't be against trying an idea again if it seems like on paper it could make a lot of sense. There's a lot to like about the potential of this solution; improved efficiency, density, etc. Heck, you might even make a fun side project of trying to reclaim that waste heat and turn it into electrical generation. I just think the plumbing alone is likely to make it cost ineffective compared to existing air systems and then add quite a bit of potential maintenance headache.