How do I upgrade my graphics on my laptop?

I recently bought an HP dv6 6180us laptop. The PDF datasheet says that I have a Radeon HD 6770M switchable graphics card with 1024 MB of GDDR5 RAM and up to 4096 MB total graphics memory.

How am I able to upgrade it to 4096 MB? Do I need to buy something, and if I do, can you please provide a link to what I need? I am already going to upgrade to 16 GB of RAM.

Also, is it worth it to upgrade to 4096 MB? I'm about to study computer science if that helps at all.

Thanks in advance!

Upgrading the graphics on a laptop is generally not possible. The graphics is embedded directly as part of the laptop motherboard. The "switchable" indicates that the operating system is able to intelligently "switch" between the Radeon and another integrated graphics on the CPU, based on the need of the application being used.

Also changing the graphics memory is not really necessary (or possible). Graphics memory is generally used for gaming, particularly at very high resolutions. The extra memory is helpful to store large game scene textures and effects.