An experiment i've been conducting for quite some time now. Mobility modding the firegl driver from AMD/ATI. Why? Well the FireGL driver is supposed to give much more smoother performance than the Radeon one plus A LOT more stability. So here it is the 7.9 mobility for the nx9420 (and other models).
Ati 7.9 mobility
Here are a few of the improvements i noticed:
* smoother vista animations (this is nice).
* better directx performance under Autodesk's line of products.
* opengl is still the same since you do not have a true firegl to use the optimised version.