We measure system-wide power draw from the wall while running Cyberpunk 2077 for 30 minutes.
Total system power draw does show some difference, with the Gaming OC pulling just over 430W, compared to the 410W draw of the Noctua card. The Founders Edition is the lowest of the three, with the whole system pulling 392W.
We also 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. This provides us with significantly more accurate data to work with as it is measuring only the GPU power, and not total system power which is a fundamentally imprecise measurement.
Over the five games tested, the Noctua card averaged 242.2W power draw, which is about 20W less than the Gaming OC. The RTX 3070 Founders Edition, meanwhile, averaged 223.9W.