You're going to notice a speed increase in context switches such as when you go from a game screen to the desktop screen (by pressing alt+Tab, for example), but memory bandwidth is what really is going to up your performance, not amount (unless you are already starved for space). That's why DDR is such a great thing. I just recently did the same thing as you and bought 128MB more. Since memory is so cheap right now I thought I would capitalize. Anyway, a context switch would also involve situations you see in games like Need for Speed and MotoCross Madness2, where you are switching from the racing environment back to the menu mode. These have improved for me by maybe a couple of seconds (down from 5 to 3 seconds, maybe). The person telling about hardrives was right too. In a case like ours where we already have enough RAM, other things are going to operate as the bottleneck. The harddrive is probably the culprit in my case too in a lot of situations as being the bottleneck.
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