Terve Räikkönen,
you won't get what you are looking for unless you update your rig. You need an AGp mobo and a damned good graphics card. I have both games and they run well with my rig at high resolutions and all the goodies maxed. I must admit I had problems with GP4 for a while and was about to give up. I changed my mobo (damaged goods, guarantee still in force) and switched graphics card drivers. Runs like a dream now, I keep 37 fps as standard and it never goes below 34 even at the back of a full grid.
F1C fps run at 35-60 depending where you are on the track. Replays drop their fps to below 20 for half a second here and there, but the game goes well. The grid is the difficult part, there i may see 24-30 fps depending on the track.
Visually of the 2 games GP4 rocks best with my rig (see my signature for details)
Larry
AMD 3000+,Epox EP-8RDA,Ram 1536mb 333 DDr, Rad 9800 pro omega 2.4.96, dx9b, Audigy, MOMO FF,winxp