Good to know. How do you disable boost clocks? And did you measure the power consumption from the wall?
The way that I disabled the boost clock of the GPU was through the manufacturer's software, such as Zotac's Firestorm application. You can either have it configured on to the software and it will load the settings on start up, or you can have it set on the GPU's BIOS. I have measured the power consumption of the system, and under gaming load it usually remains around 130 watts of constant power draw. (Both the GPU and CPU [Underclocked and Undervolted] are set to 90% power consumption)