Dell products, but not from dell?

hello,

i have a broken GPU, and need to replace it. i assume i have to change the whole graphic card, is that right?

also, i do not want to buy it from Dell. does anyone know about a site that can sell me parts that fit, and work to my Dell system?

thanks alot!

XPS M1710

Genuine Intel(R) CPU T2500 @ 2.00GHz (duo core)

1Gb RAM (2x512, 667 MHz)

GeForce go 7900gs 256 Mb