So far I bought a new graphic card, GTX 550 Ti 1G which replaced old one, ATI HD4850 512MB.
I expected much frame rate improvement, but there was only a few frame rates improvement, not significant one.
I have 2 PCs which are identical in its specification (CPU, mainboard, RAM,….). One is with GTX 550 Ti 1G, and another is with Geforce 9600GT.
I tested with same conf.ini and 3D set-up in Nvidia control panel.
I checked each frame rates with internal FPS counter in IL2 FB 1946 (Shift+Tab keys, then ‘fps START SHOW’).
Surprisingly both ones showed almost same results.
Someone says there will be less improvement if the game is an old game.
I guess this might be the case since the graphic engine of IL2 FB 1946 is old one.
Honestly I bit disappointed with that result.
I regret that I should have bought 9600GT card instead of GTX 550 Ti.