Hi, i just upting here an old system "Asus A8n32 CPU Athlon +4400, 2GB ram 8 but i can put up to 4 GB) 7 windows" and.. i have this 3 cards there; 7600GT, 9600GT, and GT440, all from asus, but i don't know which of this 3 should i put, which of this 3 you guys recomend?