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 Alan Wake II (4K) for this testing.
We only compare against the 4090 FE for our power testing we've started to use Alan Wake II for this. As we can see, the Acer 4090 does draw almost 30W more power than the FE – perhaps down to the less impressive PCB design, or it could just be the silicon lottery.