Iceciro,
SLI won't help in SupComm anyway. A multicore CPU, good single graphics card, and 2 or more GB of RAM are the important components. What is your single-core CPU?
Pyrion,
The extra RAM may be just what you need, what are your CPU and video card specs? A really good single core may run SupComm acceptably...also, the devs are looking to make more optimizations in upcoming patches so that may help. From what I have heard, they concentrated on stability more than efficiency in getting it out the door to the publisher, and now they are looking to make the code efficient and streamlined. So if the hardware upgrade doesn't help, you may wanna try again after the next patch in a month. (I myself haven't had hardly any time to play since the beta ended, though I have had the game for weeks; but my system is a 4400X2 with a 7900GT KO video card and 2GB of good PC3200, plus I don't play much multiplayer, so my system was good enough even during the beta.)