That depends entirely on how you intend to use your computer. I have a relatively old graphics card as I'm not interested much in using it for games nor any other graphics intensive tasks. If you feel you're not getting the most out of it for your needs, then you should most definitely consider whether it's time for an upgrade.

me too, I don't use it for games or so, just for working on the internet and typing. but what makes me think of that is my new flat monitor, it flickers from time time.

They're built into the side of the monitor? I doubt that's the cause of your screen flickering, my guess is it's either the monitor itself, or driver/software related.

Which graphics drivers do you currently have installed?