Here is here is something I read earlier about sli and ED
How to enable SLI

Hello, Commanders.
We're hard at work getting the Beta as stable as possible. Thanks to your continued bug reports and posts we are already looking into and resolving several issues.
We've decided to include a setup guide for running Elite: Dangerous with SLI. Please follow the steps below:
1.- Open nVidia Control Panel
2.- Go to “3D Settings” > “Configure SLI, Surround, PhysX”
3.- Make sure the option “Maximise 3D performance” is selected (“SLI Enabled” should appear below the panel “SLI Configuration”)
4.- Go to “3D Settings” > “Manage 3D Settings”
5.- There are two options now:
We're hard at work getting the Beta as stable as possible. Thanks to your continued bug reports and posts we are already looking into and resolving several issues.
We've decided to include a setup guide for running Elite: Dangerous with SLI. Please follow the steps below:
1.- Open nVidia Control Panel
2.- Go to “3D Settings” > “Configure SLI, Surround, PhysX”
3.- Make sure the option “Maximise 3D performance” is selected (“SLI Enabled” should appear below the panel “SLI Configuration”)
4.- Go to “3D Settings” > “Manage 3D Settings”
5.- There are two options now:
- · The quickest way is to enable SLI for ED is to go to the “Global Settings” tab, then find the feature “SLI rendering mode” and make sure its value is “Force alternate frame rendering 2”. This SLI mode will then be enforced for more programs than only ED, so in some cases the next option would be more suitable.
- · If changing a global setting isn’t viable or a more fine-grained alternative is preferred, go to “Program Settings”. Find ED in the dropdown list (under a program to customise). If ED isn’t listed, then press the “Add” button and select the executable in the dialog. Once ED is selected, then find the feature “SLI rendering mode” and make sure its value is set to “Force alternate frame rendering 2” (by default it will get the value from the corresponding global setting).
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