Some interesting notes here from how to fix a shimmering [checkerboard] TAAU result for high frequency detail like foliage. I'd say the final output results are truly night & day.
In terms of raw internal pixels, H:FW in this mode uses up to the equivalent of FSR2/DLSS2 Balanced Mode (only checkerboarded grid coverage of each frame rather than jitter patterned regular grid) with dynamic scaling below that to maintain framerate.

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