How do I change Dedicated graphics memory

I'm Trying to change the Dedicated graphics memory for my Laptop Since right now its only 256 MB out of the 3067 MB It has. I can't figure out how to change it.

Computer Specs :

System
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Manufacturer TOSHIBA
Model Satellite C650D
Total amount of system memory 8.00 GB RAM
System type 64-bit operating system
Number of processor cores 2

Storage
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Total size of hard disk(s) 233 GB
Disk partition (C: ) 55 GB Free (233 GB Total)
Media drive (D: ) CD/DVD
Media drive (F: ) CD/DVD
Media drive (G: ) CD/DVD

Graphics
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Display adapter type ATI Mobility Radeon HD 4200
Total available graphics memory 3067 MB
Dedicated graphics memory 256 MB
Dedicated system memory 0 MB
Shared system memory 2811 MB
Display adapter driver version 8.632.1.2000
Primary monitor resolution 1366x768
DirectX version DirectX 10

Proactiveboomer, welcome to the Seven Forums.

Unless there is an option in the bios to change it to 512 MB, you can't. Also if it is there and you increase, you will also have less system memory.

As far as that 3067 MB available that is the total of dedicated and shared, and the shared only gets used if/when the dedicated is filled up. This might help some,

Video Memory Virtualization - A Brief Guide

If the drivers or BIOS don't allow you to set it, you might not be able to. I'm not sure of the reason why you'd want to, as it won't make the graphics more capable or faster.