580 1.5gb here and i'm getting mixed results,
significant gains low over London but smaller drops in some other situations, in particular number of aircraft seems to have a greater affect than previously.
Light clouds there is a very small increase in fps but with 'heavy' clouds fps drops to levels a little below previous fps (and as fps was low previously this can be rather detrimental).
In general, for my style of offline play (large, historical type missions) the difference is often enough to tip a previously playable mission into 'unplayable'.
Shadows seem to have a greater affect than previously (i normally run with them off but keep hoping)
But as mentioned sometimes there are improvements, so i can't say it's a total loss of fps.
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