https://www.hardwaretimes.com/nvidia-rtx-a2000-offers-better-ether-mining-efficiency-than-the-rx-6600/
AMD RX 6600 XT (Tuned): 33 MH/s @ 55W (0.59 PPW)
AMD RX 6600 Non-XT (Tuned): 30 MH/s @ 50W (0.61 PPW)
NVIDIA RTX A2000 (Tuned): 41 MH/s @ 66W (0.62 PPW)

うちは、
6600無印 29MH@43w（0.6744）
6600xt 32MH＠49w（0.6530）