Not as dense, slow and hot needing more cores and power, ROB size detracts from the memory latency penalty. The results were bunk in the first place. Like
@DrMrLordX said, you either run similar setups including RAM speed because it makes the most sense or you run JEDEC speeds which are very slow and not used by anyone outside ODM buyers who buy office machines built using the lowest end parts which are not the target purchasers of this or any other game. You run RAM the same and let the pros and cons of the processors speak for themselves. Not kneecap them with slower RAM settings all over the place, especially in a game with an engine that seems to be bandwidth sensitive.