Who overclocked his Raspi knows how hot as a processor, and in particular the memory can be. Remedy these self-adhesive heatsinks, must of course to the housing at least allow a little air movement.
The set includes 3 heat sink, the Raspberry Pi B I know right where all 3 get there, the B + I first applied only to the processor and the memory a, which voltage is Regeler the warm, I will still have to determine.