Works when used correctly. I used this in a project I'm building. I need to experiment with CPU overclocking; The GPU and its performance are well above their ratings, so I need serious cooling. I am using a set of thermoelectric coolers and one side gets very hot. A conventional radiator does not work; not even with a fan. That's why I decided to use water cooling. I glued a thermoelectric cooler on top with thermal paste, then passed ice water through and it works. I actually have a small pump and a bucket of ice and water to cool me down. I suppose you can also use a heatsink with a fan, but the thermoelectric elements get very hot and I went with ice. When the ice melts, I drain the water and put in new ice. Note: My project requires active supervision, so ice replacement is not a big problem. You must choose the solution that suits your needs.