Not really ... what are your other components? Chances are that if your CPU and video card are limited, 1Gb won't do crap for you. If it's a Celeron, Celeron D, Athlon XP or Sempron processor, 512Mb is really the max you need if your not gaming (which will perform not great anyway since these processors are bugdet ones).
But really, list your video card/chip/adapter and your processor model and speed. Giving us more information about the memory would help too.