I'm not familiar with nVidia cards but there is a common issue with multi GPU cards (both ATI and nVidia) causing stutters in IL-2. I suspect this may be the culprit, try lowering the AA down to 2x in the video card drivers, this fixed the problem on my 4870x2.
A more general stutter issue I had relates to drives. It is also recomended on Gigabyte boards to use the Intel ACHI drive controller rather than the Gigabyte one. I'm assuming all your drives are SATA so connect them to the Yellow sockets, make sure you have ACHI enabled in the BIOS and have the Intel INF drivers installed v8.3.1.1011.
Hope this helps.
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