The memory modules are provided on a black plate with gold passive heatsinks (heatspreader) 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 Crucial by the way grants lifelong warranty (Limited Lifetime Warranty) for the buyer (all informations to manufacturer conditions are of course without guarantee by ocinside.de).
Here’s another picture of the fancy Crucial Ballistix modules …