Comment by sweetjuly

The article also mentions they had trouble measuring power usage in general so we can't necessarily (and, really, shouldn't) conclude that it has no impact whatsoever. I highly doubt that AMD's engineering teams are so unprincipled as to allow people to add HW features with no value (why would you dedicate area and power to a feature which doesn't do anything?), and so I'm inclined to give them the benefit of the doubt here and assume that Chips 'n Cheese simply couldn't measure the impact.