If I were to upgrade my graphics card...

[Blue]

Then would I have to upgrade anything else?
Motherboard for example
Thanks for any replies :)

[Agnostic Bear]

Then would I have to upgrade anything else?
Motherboard for example
Thanks for any replies :)

Depends on the graphics card and motherboard.

[Blue]

Depends on the graphics card and motherboard.

Its a gigabyte S series and I'm thinking about one of the Nvidia 9000 series

[Recursion]

the 9 series is crap, the 8 series was better :o wait a couple of months then see, you may need to upgrade your PSU, the Gigabyte S series is PCI-E i think, so you should be fine.

[Blue]

Okilly doke :)
I would think my psu is good enough

[Zaub]

For a high powered GFX card I'd go for at least a true 600W.