If you want to obtain more framerate from merely a CPU upgrade, be sure it has a worthwhile enough increase in single thread performance. Otherwise, it may be best to save your money for the major system upgrade. I'm in the same boat with an AMD X6 1090T BE. EDIT: X-Plane renders with a single-thread, so throwing more cores/threads only helps with the flight model, AI aircraft, etc. This is why single-thread CPU performance, not overall CPU performance, will have the greatest material effect on framerate, assuming the GPU isn't the bottleneck. When using the fps indicator in X-Plane, pay attention to the relationship between the fps and cpu indications. As a general guideline, if the cpu indication is above .900 and your GPU is not anywhere near max utilization, you are CPU-bound. Conversely, if your GPU is running near max output and the cpu indication is well below .900, then you are GPU-bound. You can use either GPU-Z or your Catalyst Control Center to read your GPU load. I prefer GPU-Z.