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.
That increase in power over the Founders Edition (+10%), coupled with a relatively small increase to gaming performance (+3% at 4K) means performance efficiency has reduced slightly for the RTX 3070 Gaming X Trio. Not by a whole lot, but its FPS per Watt value is about 7% below that of the Founders Edition. It is still 8% more efficient that the RTX 2080 Ti FE, though.