This is actually the case. The DCS series is CPU heavy, not GFX heavy, so your CPU will naturally be the bottleneck, even if you have a kick-a$$ video card. Also, the code is not multi-threaded, thus your i7 is only using 1 core to run all of the calculations that go along with a very accurate flight model, and the gfx card has to wait for the data.
EthrealN: sometimes I think you get paid for sniping.:D