Pick whatever is state of the art in Q1 2012. That way you'll be sure to be able to handle "Battle over Moscow" as well.
(typical single missions in Il-2:FB required a rig which was a little over two times faster than the original Il-2 system requirements - if the engine upgrades don't push up the resource needs, then the mission builders will).
That said I could do with advice regarding the fastest RAM currently available and other performance configurations. I don't keep track of these things anymore.
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