I just tested it and set up a default 747 at gate 105 in KLAX, at sunset and with cloudy weather. I had 30 frames in all views, inside, outside: outside it even spiked to beyond 40, bypassing the frame limiter. I relocated to the runway, and then some taxiways: 30 fps, never less. My system is inferior to yours: i5 2500, 8 GB, GT460 SE (1MB).
If you made the cfg-tweak correctly, set up the frame limiter correctly, copied the settings as posted and have not messed up your nVidia driver settings, then I am running out of advice. Something maybe bottlenecking your system somehow?
I would head to Avsim forums now and ask for advice there.
Good luck!
P.S. Recheck your nVidia driver'S settings, make sure you have no utopic settings running from there with FSX. If your driver gives you issues bog or small with other game, use an earlier vrsion. I for example find 275.33 to be the last one that gave me no issues with all games I use - all later versions I tried (until the latest) gave me issues here and there.
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If you feel nuts, consult an expert.
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