Certain cards allow up to four simultaneous cards running in SLI. Most cards are made for two-card setups. More cards means more power required.
The cards need to be made by Nvidia but not necessarily the same manufacturer (E. g. Gigabyte or MSI) and be the same model and memory amount. The cards do not need to be the same clock speed, though you may see a decrease in performance output if the speeds are not the same.
The bridge is not required for SLI to be enabled. If there is no bridge present, the SLI connecting will be made through the PCI slots of the motherboard. This will result in reduced-performance.
If the installation doesn’t start automatically, download the latest drivers from the NVidia website, and run the installation file once the download is complete.
Select “Maximize 3D performance” and click Apply. The screen will flash several times as the SLI configuration is enabled. You will be asked if you want to keep these settings. If the option is not there, your system is most likely not recognizing one or more of your cards. Open the Device Manager in the Control Panel and check that all of your drives are visible under the Display Adapters section. If your cards are not showing up, check that they are connected properly, and that the drivers have been installed for all of them.
You can make adjustments to individual games by clicking the Program Settings tab and then selecting “SLI performance mode”.
Run your game. Once you have a game running, you will see the bar change. A taller bar means that SLI scaling is increasing, meaning that your SLI cards are working well and improving your visuals. If the bar is not very tall, then the SLI configuration is not affecting the display as much.
