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SLI working without bridge. Confused

insanityinspace1
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As the title says, I have an MSI 980 ti SLI set up. Now my bridge is an MSI bridge that has a light up logo. This stopped working a long time ago and I assumed it was just the LED, but today I pulled off the bridge entirely and SLI is still working in games like Rainbow six siege and in benchmarks like fire strike and valley bench mark.
 
I know sli can work without a bridge but apparently it can impact performance. I checked fire strike however and compared to similar builds I get similar if not higher results. However when trying SLI in PUBG my frame rate tanks horribly.
 
I want SLI communication to take place across the bridge. Is there anyway I can force that? How can I check if communication is taking place across the bridge or across the PCIE lanes.
 
My build is as shown here, maybe it'll provide answers:
I7 6700k 980 ti SLI 16GB RAM Gaming M7 Mother Board by SLI
If you need anymore information I can provide.
Thank you!!
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