I was actually thinking of increasing my graphics card to 256mb, would this need a psu update, and if so, what would be the minimum?
My graphics are currently NVIDIA GeForce 6100 nForce 405.
The nvidia 6100 nforce 405 is onboard graphics, its not a separate descrete card.
Depending on which one you go for ( 256mb is not enough btw ) a 512 or a 1gb will do you better.
What do you want to do with it.
What games do you want to play as your current is a direct x 9 card which uses system ram to work. Abiet not a very powerfull one at that. It will play sims and low rate fps like battlefield 2 ( just about ) etc but not the latest stuff.