The memory modules are provided with azure passive heatsinks (heat spreader), which are supposed to enhance the memory cooling also with higher frequencies and/or higher voltages. Thus one achieves on the one hand better results with overclocking and on the other hand a longer life-time, whereby G.Skill by the way grants lifelong warranty (Lifetime Warranty) for the buyer (all informations to manufacturer conditions are of course without guarantee by ocinside.de).
Here’s another picture of the nice G.Skill modules …