My suspicion, without really knowing, is that they are voltage regulators -- i.e. the CPU runs at a different (lower) voltage than what is normally provided by the motherboard/socket so the voltage regulators on the package lower the voltage to the appropriate level for the CPU. It looks to me like they took a mobile processor (BGA) and stuck it on a package/adapter for desktop LGA socket. This probably would affect overclocking attempts in the sense that although you should be able to raise bus speeds and multipliers (assuming the CPU is unlocked) you very likely won't be able to increase the CPU core voltage -- even if the motherboard/BIOS thinks its raise, the voltage regulators will keep it a the "correct" voltage.