Two same video cards different brands, different video bios, cant SLI

I just bought another 550 ti, one is a msi i belive and the other is a pny, i have both installed and both show up in device manager. But no sli option i have a sli bridge connected and i also have updated my comp bios and my video card drivers, but still no sli option. I noticed that my video card drivers are different but should that matter if so how can i slove that.
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More about video cards brands video bios
  1. Delete all the drivers and reinstall with both cards in. Make sure your board supports SLI!
  2. What are the rest of your system specifications?
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