GunslingerOCS
No dice, still 2x SLI max

Are all your pci-e dip switches set to on?

Sajin
 
Are all your pci-e dip switches set to on?

Yes.

Do all three cards show up as running at pcie x16 3.0 @x16, or as pcie x16 3.0 @x8 for the bus interface inside gpu-z?

3.0 @ 8x
Talked to Nick Shih, he thinks there may be a bug in the bios for auto switching the pci e slots, supposed to have an answer on Monday.

WOW! Not a bad looking MB Back Side
 
Thinking of trying this one out, never had a MB from them before. My Memory is on their list F4-3200C14Q-64GVK

GunslingerOCS
3.0 @ 8x
Talked to Nick Shih, he thinks there may be a bug in the bios for auto switching the pci e slots, supposed to have an answer on Monday.

Ok.
 
I still think the bridge matters...
 
https://forums.evga.com/E...d-Record-m2717193.aspx

Maybe go back to X99 or X79 where this was easier :P haha.  Good old 40 lane xeons make life so much easier when you're trying to SLI cards.  
 
In all seriousness, I hope you get this figured out!

games attached tomb raider rise of  4k and witcher 3 4k In order to get it to work you will need one of the LED bridges such as msi or evga I have had the evga pro v2 3 way bridge on titan xp's in 3 way sli and with great scaling you also have to change the settings in nvidia inspector like sanjun has posted head over to guru3d forums and ask for venturi he will tell you exactly everything needed to get it working.
 
https://forums.guru3d.com/threads/functional-4-way-sli-pascal-titan-x.409468/
 
 
 
 

Nice Score GunslingerOCS  #11 under the Hall of Fame

What finally got it to work? Bios update? Proper sli bridge?