Is it possible for me to upgrade my non-integrated video card on my laptop?

[sweetactionpat]

I have an Acer Aspire 5560-Sb613
The video card is NOT integrated.
It has a AMD Radeon HD 6620G with 512 MB Graphics card.
I want to upgrade the video card. I have money to spend and would like a very generous upgrade and spend under $600.
Is it possible to put in an upgraded video card into this laptop?

Thank you for any help you have to offer.

Best Regards,
Sweetactionpat