EVGATech_BrandonS
There's a difference between this generation and the previous. There are 2 SLI connectors on the 1080, but they are both used by the SLI HB bridge for one SLI connection. 

While this is true, they also stated that the current SLI bridges will also work, but claim lower performance with them. The key term, which we've heard in the past is 'officially support'. This is the same as they claimed with the 700 series which someone pointed out prior which did work in 4-way...but not *officially*. That doesn't mean the 1080 will work in 3 or 4 way, but I wouldn't abandon all hope until it is demonstrated to be the case. On the other hand, this makes sense. As GPUs get more powerful, relative to the rest of the system, the advantages of SLI decrease even more drastically past 2 GPUs. Some may recall there were several scenarios where 4-way actually had negative scaling.

Look's like the SLI fingers on the PCB are identical to previous generations. All this means is that the new bridge leverages both fingers at the same time for double the bandwidth over the single finger solution before. This should lead to better SLI scaling as I am sure the old single link solution was tapped out (hence poor scaling). 
 

This also means you don't need to purchase the new bridges. Just use two current flexible SLI bridges and connect each respective finger to one another.

Scarlet-Tech
I do want to see an end user benchmark with the original SLI bridge and the HB SLI Bridge.

I want to know if the old ones will even work.  Several of the more 'reputable' sites state that the old bridge will not work at all as it is designed to pass the information across both connectors simultaneously.  Without the new HB bridge, you won't be able to pass the data at all.  I think that is what EVGATech_BrandonS was trying to get across earlier as well?

Guys NVidia is only showing what they reference, which is their own SLI bridge. And from what it looks like, the new design only allows 2 cards to be paired together. However, if you look at NVidia's old SLI bridges, they supported up to 3 cards. http://www.geforce.com/hardware/technology/sli/bridges
Aftermarket companies like ASUS, EVGA, MSI, etc, create 4way SLI bridges. This doesn't imply that the GTX 1080 series is limited to 2 cards. Maybe by Nvidia's reference SLI bridges, yes. But it doesn't mean EVGA can't be like, ok well here's our 3 or 4way high bandwidth SLI bridge.

CoercionShaman

Scarlet-Tech
I do want to see an end user benchmark with the original SLI bridge and the HB SLI Bridge.

I want to know if the old ones will even work.  Several of the more 'reputable' sites state that the old bridge will not work at all as it is designed to pass the information across both connectors simultaneously.  Without the new HB bridge, you won't be able to pass the data at all.  I think that is what EVGATech_BrandonS was trying to get across earlier as well?

Yes the older bridges will still work, more details on this soon.

Maverick1776
Guys NVidia is only showing what they reference, which is their own SLI bridge. And from what it looks like, the new design only allows 2 cards to be paired together. However, if you look at NVidia's old SLI bridges, they supported up to 3 cards. http://www.geforce.com/hardware/technology/sli/bridges
Aftermarket companies like ASUS, EVGA, MSI, etc, create 4way SLI bridges. This doesn't imply that the GTX 1080 series is limited to 2 cards. Maybe by Nvidia's reference SLI bridges, yes. But it doesn't mean EVGA can't be like, ok well here's our 3 or 4way high bandwidth SLI bridge.

Incorrect. All the new bridge does is take both SLI fingers and use the bandwidth on both. This limits you to two cards maximum talking to each other. The old 3/4 way SLI bridges only had single finger SLI links talking between the cards. Hence why the new bridge as exactly "double the bandwidth".  

Sounds reasonable, The gains from 3 way sli is not that great anyway, motivation to improve 2 way sli performance is awesome

damn i got 15 days to step up hope they release it so can make the time line. as for sli??? meh im ok with 2 sli
 

Running a 3rd card dedicated to PhysX hasn't changed right? This only has to do with the new bridges right?

ShadowPh0x
Running a 3rd card dedicated to PhysX hasn't changed right? This only has to do with the new bridges right?

Correct.