Check this homemade WB out

[nikhsub1]

ok heres a question, if i take a normal waterblock and replace the top with a copper one thats horribly tall and just a solid brick of copper. would that hurt anything?

Yes it would end up hurting performance. Why? Because as the post I quoted below says, the 'horribly tall solid brick of copper top' would pick up heat from inside the case then end up transferring that heat INTO the water having the exact opposite effect that you would want. Naekuh is right about one thing, we seem to be repeating ourselves over and over. I already explained that the top to any WB has ZERO effect on cooling in regards to size and material...

Yup, it would help store the heat the first minutes, and then slowly releases it to the water. Like a giant heat capacitor.