We have been trying for years to use less resources in the datacenter and use air cooling, now we are putting more water cooling into our server designs. I cannot see this as a technological improvement. Again we are curing a problem that should not have happened in the first place. We need to solve the problem in the first place, that is do not make CPU's/chips so hot that they need to be water cooled. We are just making computers so much more difficult to manage by adding water cooling within servers.

Problems with water cooling within computers.

1) Complexity (need water in addition to all other cabling within datacenter)
2) Extra costs (any addition to electicity water cooling requires additional power in a datacenter, which adds costs)
3) Safety (water and electricity are a dagerous mixture, always a risk of water leaks)
4) Increase management (need a whole extra water cooling infrastructure and pipework)

I know that history has a habit of repeating itself, however can we not improve upon designs and techniques from the last century and make cooler less hot chips.

Prevent hot chips, hot CPU's are a design flaw. A cure such as water cooling always costs an order of magnitude more than prevention of the problem in the first place.

A green datacenter should not have water cooled computers. Anyone using this water cooling to heat the building is adding immense complexity. What happens when we kick out the water cooled computer, do people in the building freeze. If we have a water pipe leakage do we have to swith off the water cooled computer while the rest of the air cooled computers continue running. Water cooling computers just have too many downsides and add so much more complexity. We can make life more simple by avoiding water cooled servers and using air cooled systems.

I started work with old IBM mainframes, Amdahl, Hitachi etc. There were always extra problems with water cooling much more to go wrong. Now do we really want to have water pipes all over the datacenter. Not really, ideally we try to have less cabling, pipes etc. That is why it is better we have protocols and cabling improvements like FC, SAS, 10GigE with increased bandwidth and hopefully less to manage. Now we add water pipes in the computer room, it was problematic and costly 20yrs ago and still is.

As all electricians know, water and electricity are a lethal mixture. Avoid water cooled computers.