Haswell has got an integrated power management system which clubs various voltage regulators into one controller, said to dynamically regulate voltage, and thereby let the CPU cool faster, when a core is idle or turned off.

Well, I guess part of my question is answered regarding "voltage regulator"....amazing...

Now, are those regulators regulating a discrete power(line) source?

IMO, they are

Most fascinating....that explanation to be competing with ARM

doni