By using the GPU-Z Board Power data in conjunction with the 11-game average FPS data we presented earlier in this review, we can work out performance per Watt for each graphics card. This is presented as FPS per Watt.
Given power draw is 16% higher with the RTX 3090 Gaming X Trio than the RTX 3080 Founders Edition, while the 3090 is also 14% faster on average, performance per Watt is effectively matched between the two GPUs. Both deliver 0.25FPS per Watt based on our 4K data.