A:Answer This depends on the CPU and the other system components power draw, If it has a decent efficiency rating and if the power supply is quality, you could get away with 600w. Id say a reccomended unit would be something like a Corsair CX650M if you are paring this with a CPU with a TDP of less than 150-200W (so something like a Ryzen 5 7600X). People reccomend 750W for peace of mind and for future upgrades.
Logically, 600W is the minimum and you can get away with it. I think best buy mislabeled the reccomended watts. That is the TDP of the 4070 they labeled; 200W. They must have mistook it for the reccomended power supply.
