Depends on how hot they get. I'm using Thermalright Mosfet Coolers with the thermal pad that came with them. I've no need to use arctic ceramique because they never get hot with my Q9450@3.72GHz.
With my Pentium D 840@4.2GHz it's something completely different and the Mosfet Coolers get pretty hot. Using better thermal paste could have helped to keep the temperature down.
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