There is no rush, ARMA III is so far the only game I have been unable to play at max settings.The problem is it's very likely that you are running the second slot at x4 speed, the impact isn't that major, but considering the bandwidth use of the bus, the performance is only about 10 to 15% slower on that slot, it is relative small, however that said, in single GPU mode the bus runs at full x 16, with dual GPU mode the speed drops to x8 on the first slot, that is because the slots both share the same bus, and bandwidth needs to be shared. This creates a fairly big problem on dual 7970 cards for example or two titans, these cards are a lot more capable of using more of the bandwidth the bus allows.
Which in return on a slower CPU creates a bottle neck, on both ends the CPU and the bus bandwidth.However don't be fooled, when some one mentions that the GPU memory runs at so many gazillion mega herts, this results in the bottle neck. GPU memory bandwidth is not linked to the bus bandwidth, it's the bandwidth between the GPU and GPU memory, people seem to confuse the 2.
Will a I3 bottleneck two 7850's not very likely, they simply don't use enough bandwidth, even at x4 and x8 bus speeds.
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