We measure system-wide power draw from the wall while the card is sat idling at the Windows 10 desktop for 30 minutes. A reading under load comes from running the 3DMark Fire Strike Ultra stress test 20 times.
Power consumption is 5W higher than the MSI Gaming X GTX 1660 Ti, though the Gigabyte does run at a higher frequency so this is to be expected. In any case, it's still less than a GTX 1070 – while performing more-or-less the same in games – which demonstrates the improved power efficiency of the TU116 GPU.