I just upgraded from a GTX 660 to a 760 on my i5 3570k at 4.4 Ghz (single monitor at 1920x1080). I ran a benchmark flight using FRAPS at KSEA with REX 1024x1024 clouds and rain, DX10, and Orbx scenery. The result was 0 change in min, max, or average FPS (by comparison, published benchmarks for modern games is a 25-35 percent FPS improvement with a 760 compared to a 660). That's ok, as I bought the upgrade in anticipation of P3D v2, which promises to make better use of the GPU. I just thought I would share. As Doug Horton has well documented in his extensive benchmarking, FSX is CPU limited. A GPU upgrade will produce an insignificant improvement in FPS once you reach some baseline level of GPU such as a 500 series. Save your money for something else unless you use the GPU for other programs. Sorry, but Nick N is just wrong when he insists that a high powered CPU must be paired with a 680 or 760-780 GPU. A 660 is more than adequate for FSX. Edit: of course, multi monitor and higher resolutions may benefit more from a GPU upgrade than my setup.
Yes I agree with you on that in 1920X1080. My 660Ti run smoothly most of the time in that resolution as long as I dont go the area like KSEA or PANC.