How does a Motherboard detect a CPU/Cooler Change

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Joined
20 Aug 2011
Posts
182
Hey,

I just changed the cooler on my CPU and to clean thermal paste off i took the CPU out, I put it back in installed the cooler etc and booted up

I got "New CPU installed, please enter setup yada yada"


I was just wondering, how does a motherboard know you've took your CPU out and put it back in, or did I get this message because the cooler changed?
 
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