I have the same issue with a 4890. The fix is to change to Excellent settings when using the FMB.
As I am a keen mission-builder I have set up a separate installation with a different conf.ini to use exclusively for mission-building. Once completed I just transfer the mission files (.mis & .properties) to the 'Perfect' installation. It only takes a few seconds to swap, and about 10 GB disc space to set up the 2nd installation. Preferably on a separate partition.
Overclocking is not the issue here: it's just IL-2 showing its age. My game runs glitch-free with a 12% system overclock, and so does the mission-builder if used as above
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Another home-built rig:
AMD FX 8350, liquid-cooled. Asus Sabretooth 990FX Rev 2.0 , 16 GB Mushkin Redline (DDR3-PC12800), Enermax 1000W PSU, MSI R9-280X 3GB GDDR5
2 X 128GB OCZ Vertex SSD, 1 x64GB Corsair SSD, 1x 500GB WD HDD.
CH Franken-Tripehound stick and throttle merged, CH Pro pedals. TrackIR 5 and Pro-clip. Windows 7 64bit Home Premium.
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