Are you saying Intel CPUs now can adapt to power loss, instead of just not working? I doubt that very much. The CPU got too hot(easily reaching 100C) so there was definetly not "plenty of headroom", in fact, there was no headroom at all.
If the CPU draws more current than the VRM can handle, this is usually okay within bounds for a very short time, after than you'll get dropping voltage when the VRM starts to self regulate and the CPU will downclock in response.