Griffin,
I am running a CPU very similar with what you have, Q9450 overclocked at 3.9 GHz with water cooling. It works great for DCS, even with lots of pixels to be driven :)
What video card do you have? I have found that the GPU is the bottleneck in my configuration, in particular the VRAM. My next video card will have 4GB or more.
Also how many monitors you use and what resolutions?