Currently Being ModeratedApr 29, 2012 1:02 AM (in response to epicbobman52)
The Geforce 9400 with 256MB RAM is shared with your system RAM, it's not dedicated graphics memory. If you have 4GB DDR installed and up it to 12GB you will see a better overall system performance, but your graphics card will still only access 256MB from the system RAM.
By increasing system RAM to say 12GB, you are allowing the full 256MB to be used for the graphics, leaving a significant amount of free RAM for the system to use. If you are currently using the default 4GB, it's possible that memory intensive tasks are 'stealing' a bit of your 256MB graphics memory and so you see a drop in frame rate when playing games.
Increasing the RAM should help to a certain extent, but as new games come out, the graphics demands are pretty much always higher and so for newer games, you may have to drop framerate and / or detail etc to get a better more fluid gameplay experience.