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It seems the differences you're noticing are due to various factors like hardware updates, game optimization, and system performance. The newer R6 Siege might indeed require more power, but it also benefits from improved technology. Arma 3's performance can vary based on settings and hardware. These variations are normal as games evolve.
It depends on the tools needed by the game. You might try a monitoring app such as MSI Afterburner to observe and notice significantly increased GPU usage in R6.
Sure, in R6 Siege it reaches 99% effectiveness for the 49% setting. Yet, it's still surprising how much it differs.