Hello, My name is Jonathan , my brother have PC with a Asus M5A97 MOB, AMD ATHLON 2 X4 630, 8 GB RAM , ATI RADEON 5770 1GB, 320GB OF HARD DRIVE, A CORSAIR 750WATTS POWERSUPPLY, HE BUY BF3 BUT IT GETTING LAG , I NEED TO KNOW WHAT YOU RECOMEND ME TO UPDATE THE PC to play the game in high