I also don't understand the problem..
I'm running on an ATI 4870 1GB, and im NOT getting any damn higher then 23fps in campaign mode!
Even, when i put all settings to LOW or medium, it still gives me those crapped fps.
I started thinking ARMA 2 blocks my gpu, cause when i have a look on my second screen where my control panel is open, i see the GPU DOESN'T get any higher then 70% activity, its between 40 and 70%, so that is just weak.
I can play crysis maxed out, SMOOTHLESS, so why i can't play this game on at least high settings..
I run on Windows 7 RC, an 4870 and an E8500 @ 3.16Ghz..
I DO NOT, spend arround 700/800 Euro's to play at this crappy fps.
PLEASE, give an performance update, or PLEASE give an good solution!