Seems like i'm not the only one here to have issues using the 9600 card on the 17" Unibody MBP's.
I get those shimmering green/purple bits.. noticed especially on the desktop when i set it to one of my favourite photos.
I cant screen grab it because it's on the display card.. but it's the verticle green lines/purple lines.
Is this likely to be solved in firmware upgrade?
How many people are having these problems?
I just sent my MBPU back to apple yesterday because of this same problem. From what I can tell it wont show up under normal use and only when the GPU is taxed.
Could you try and run a screen saver like Arabesque for 15 minutes and then switch between the 9400 and 9600? Do the artifacts show up by doing this?
The only other way I can think of would be to run a screensaver as a desktop background and then switch the graphics mode.
Try the below and then switch modes. Tell us if the artifacts come out.
How to Use a Screen Saver as a Desktop Background in Mac OS X:
Your Mac OS X desktop does not have to be just another still picture. With just a simple terminal trick, you can use any of your Macs screen savers as a moving desktop background.
Select your "Apple Menu" icon from the menu bar in the upper left-hand corner of your screen and navigate to and open System Preferences."
Select Desktop and Screen Saver and select the screen saver you wish to use for your desktop background. Close the System Preferences.
Navigate in an open Finder window to Applications/Utilities, double-click the Terminal application and launch it.
In the new Terminal window, type in the following command and hit "Enter/Return":
/System/Library/Frameworks/ScreenSaver.framework/Resources/ScreenSaverEngine.app/Contents/MacOS/ScreenSaverEnginebackground
The screen saver you selected in Step 2 will now be running on your desktop.
Running a screen saver on your desktop can be processor-intensive and may slow down your Mac. To return your desktop to its original state, close the Terminal window and your desktop will revert to its original desktop picture.
Thanks