No offense but cooling an opteron even close to ambient is a waste.
Sure if you have money to burn and you just like messing with phase change stuff go ahead. But you arent going to gain anything from it. No rock hard data has come out but more than likely AMD is going to keep the trend of not making any enthusiast type board layouts, IE no OCing. Bumping the FSB from 200 to whopping 218 isnt limited by cooling.
If you want to water cool Opterons do it to make it quiet. Low flow, quiet pump, thin rad etc...
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