From what I've been told, it largely depends upon the game and how old it is. I recently upgraded my rig to 8 GB RAM, thinking this would solve all my fps lag and stuttering problems and allow me to set all the graphics details to their fullest, but in an older game like Oblivion I was disappointed to discover that I still could not set things to their maximum. I'm told this is due largely to the limitations of my graphics card and the age of the game rather than my RAM. ITS BETTER TO UPGRADE YOUR HARD DRIVE TO A RAPTOR THIS WILL MAKE A HUGE DIFRENCE IT COST ME A FORTUNE TO DISCOVER THIS THEY SAY PUTT MORE RAM ARE A BIGER GPU IN THIS IS NOTT TRUE ,MOST OLD GAMES DONT USE MORE THAN 4GB RAM ,ALL YOU NEED TO RUN OBLIVION IS 8GB RAM GT460 GPU A RAPTOR HARD DRIVE AND HALF GOOD CPU,IVE JUST INSTALLED A FAST SDD THIS HAS MADE VERY LITTLE DIFFRENCE IN GAME PLAY ,ON THE SYSTEM MENTIONED IM RUNNING QARLS TP3 AND THE HIGH LOD ,MOD ON FULL GRAPHICS THAT INCLUDES SELF SHADOWS ECT,THERES NOW STUTTERING IN FRAME RATE ATT ALL,MY RIG IS EX58 AUD7 I7930 ONE RAPTOR AND SSD 258MAG 8GB DDR2 GT460, I RECOMEND THIS MOTHERBOARD IF YOU BUILD YOUR OWN VERY UPGRADEABIL YOU CAN GO FROM A CHEAP I7 TO THE I7 X SERIES ,HOPE SUM USE TO ANY ONE