They're great for poseurs. If you want looks not effect then having these inside a windowed case, along with some kind of orb on the cpu, will add to your visual pleasure. If you care more about performance the I suppose it depends on just how much overclock you can force onto your system. I don't have a need for them myself, my board is a "budget" board with a fsb limit of 117mhz and a memory limit of 4/3rds of that (156). Memory around that speed is somewhat easy to aquire. But if you wanted to push your memory bus well above 166 and you increased your memory voltage to do it then memory sinks would probably be a good idea.