I have also looked at water cooling but wonder whether they ever leak, because if so the consequences would be serious
A question: every form of CPU cooler (air or water) relies on blowing ambient air over some form of cooling fins. There is obviously a limit to just how much coolth you get out of ambient air, and the hotter the ambient air is, the less CPU cooling you are going to get....I wonder what the lower limit is (i.e. the maxium cooling) you can get out of still air ?
Sure, magazines often publish tests as to which is the most efficient cooler, but there is always going to be a limit imposed by ambient air temperature.