All of you out there who have tried this share the same pain and know what I'm talking about... sunlight shining through solid objects (especially dirt hills), rainbow colored dust trails kicked up by your car when driving on dirt, among other anomalies.
I got annoyed at having to turn SLI mode manually in the NVIDIA Control Panel for TrackMania so I didn't see these anomalies. I finally found a way to not have to anymore... I tested it for about 20 minutes tonight and it seems to work great. Here's what you do:
- Right-click an open area of your desktop and select "NVIDIA Control Panel"
- Make sure you're in "Advanced Settings"
- In the left pane, select "Set multi-GPU and PhysX configuration" and make sure "Enable multi-GPU mode" is selected under "2. Select the multi-GPU configuration:" setting.
- In the left pane, select "Manage 3D Settings" under the "3D Settings" category.
- Click on the "Program Settings" tab.
- Under "1. Select a program to customize:" ... click the Add button and browse to the TrackMania executable. It could be in one of many places, depending on how you bought the game; your safest bet is to look at your desktop shortcut's properties, or the properties of the shortcut in the Programs Group.
- Under "2. Specify the settings for this program", select "Multi-GPU performance mode" and select the "Force alternate frame rendering 1" setting (see screenshot below.)
Click "Apply" and launch your game.
That's all there is to it... GG!
(Please let us know if you have success, or know of a better workaround for this... and if you noticed improvement over running in single-GPU mode.)