Laptop Graphics Card

Can I change my Laptop graphics card?
Hi.
I have a Dell Studio 1458 laptop. Because of the really bad graphics card that came with the laptop, is It possible to change graphics cards?
Intel i3 @2.40 ghz
3gb ram
Ati Mobility Radeon HD 5450
Windows 7 Professional
Does anyone know if I can change the graphics card?
no but you can buy an external graphics card
Bake your graphic card back to life!
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