How can I improve my graphics performance?

My Windows 7 performance index scores low on the Graphics index. Here’s the ifo from Windows:
Display adapter type ATI Radeon 3000 Graphics
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 8.821.0.0
Primary monitor resolution 1600×1000
DirectX version DirectX 10

Any adjustments to be made, or is buying a new graphics card the answer?