We use Nvidia PCAT to measure power draw of the graphics card only, with readings from both the PCIe slot and the PCIe power cables combined into a single figure. We use Resident Evil Village (4K) for this testing.
Power draw is the highest of any RTX 4080 we've tested, but only by 4W – it hit 329W in Resident Evil Village, still a good deal below its rated 360W TGP.