I just realize that when I go to video res settings my ATI Radeon 7950 3GB is detected has a ATI Radeon 7900 serie 619MB. I only get about 20-28 FPS on Silverstone without mirror at 5760x1080. I guess there is a issue somewhere?
Mine is detected incorrectly too. I have GTX 680 with 4gb and the .ini file always says its somewhere around 1.5 :/ Ive been manually editing the ini so that it has 4gb but I don't know if that actually does anything.
The detection process for GFX cards is a bit naff in a few games. It doesn't matter. Use MSI Afterburner or something and you will see that RF2 uses more memory than it says was detected.