I bet thats because using different motherboards. I have had many differences in crossfire scaling between different boards. I have seen Gigabyte boards gives most coherent results between different games. MSI and asus may be great on some game but not so consistent between different games.
One intresting thing what you find in some gigabyte mobos is extra molex socket in pcb just for crossfire use! I was little surprised and wondering what the heck is that for.![]()
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