It's not a microchip, it is a simple set of resistors.Intel changes the production process for CPUs from time to time and the missing resistors may not be needed for your model anymore. It's called "stepping"
Hmm, I see, i need to Google exactly what is resistor and what does it do to get my knowledge. Btw, is it possible if Intel changed something, the slot is empty for the Resistor but the soldering is still there? basically the place looks like this:
Where "  " is solder and " - " is empty space, which is that green plate that the CPU has been build upon, you can see it in that empty space, between solders