Excellent energy efficiency with 750W ! That's more than a hoover has! A little joke. The fact is: the specified power consumption (nominal, so to speak) is 320W according to Nvidia. The 750W is also stated there - but as the power of the entire system with all the trimmings. https://www.nvidia.com/de-de/geforce/graphics-cards/40-series/rtx-4080-family/