Well at http://www.hardocp.com/ they just acheived that read their [H]ardnews 3rd edition
"Ice Water:
I posted a picture here recently of a reservoir I made for one of my H20 rigs that eliminates the need for a radiator. The drawback for most water cooling systems is the fact that a radiator can only cool the water to room temperature ( at best ). By adding a thermoelectric ( TEC ) cooler to my reservoir, I have made a reservoir that keeps the water at a chilly 10c 15c at idle. This picture is to show you how big the actual completed unit actually is. It makes for a fantastic externally mounted water cooling system that can beat ANY standard water cooling temperatures out there. Take a look"