I just bought a G5 case to house my Quad Core 2.4GHz hackintosh, and would like to overclock it. The only problem is, I don't want to have heat issues, of course. What would the best heat sink be to use that would still fit inside the G5 case? Could I maufacture/build/hack together my own heat sink? Should I just put it into a refrigerated case? What would you do?