An example of the erratum can be found on page 11 of this PDF.
That says that Intel precision cooling can fail and only run at a maximum or minimum PWM for the CPU fan.
Intel said the problem was discovered by one of its inhouse engineers and said it only affected a small number of boards. "The affected component has been replaced with components that meet the higher specification requirements," he said. "All shipping units do not contain the affected ASIC." µ