[Shadows: What Graphics Cards / OS versions / Viewers support this?]

mmm, i noticed that my SL have problems with shadows aswell, maybe someone is able to help me with that problem

 

I have a ASUS G73JH (Republic for Gamers Notebook) with following specifications:

OS: Windows 7 Ultimate 64-Bit Version (Build 7601)

CPU: Intel i7 Q720 1.6GHz

Memory: 8 GB RAMM

GPU: ATI Radeon HD 5870 Mobility 1GB

Catalyst: 12.1

 

I'm able to play SL on fully settings, but as soon as i turn on shadows, then i lag badly and i have no clue how to fix that

 

with kind regards

Fox Wildung