That is very interesting. Thanks for sharing the info with us. Interestingly, I have been reading a number of game comparisons on different sites over the past few days. They don't test FSX any longer, but when they tested 'cpu intensive' games - there was no 'real' difference between the unclocked i7 950 and an unclocked i7 2600K. That brought me to the conclusion that 'probably' I would not see any difference between them in FSX either. Your test now confirms that.
Interesting to hear of the forthcoming 2800K.
Out of interest what speed was your memory in the FSX test?