GunslingerOCS
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I know it's not officially supported, but it is possible, but how do you do it? 
post edited by GunslingerOCS - 2018/01/06 13:38:15
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bcavnaugh
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Re: 3 way SLI GTX 1080 Ti - how to do it?
2018/01/06 12:24:21
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Can you not just use the Older SLI Bridges? BTW, Really Nice Scores you have  You may want to PM sam nelson he is very good on 4-Way SLI.
post edited by bcavnaugh - 2018/01/06 12:27:28
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Sajin
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Re: 3 way SLI GTX 1080 Ti - how to do it?
2018/01/06 12:52:32
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From what I have heard you have to... #1 Have the correct sli bridge. Such as 100-3W-0032-LR for 3-way, or 100-4w-0042-LR for 4-way. Bridges without metal contact points won't work from what I have heard. #2 Enable sli inside the nvidia control panel. #3 Download nvidia inspector 1.9.7.8, and open the profile inspector that is included with it. #4 Make sure you have the profile _global_driver_profile (base profile) selected. #5 Click the button "show unknown settings from nvidia predefined profiles" to show all hidden profiles. #6 Scroll down the settings list until you find the section listed as SLI, and change the following settings... - "number of gpus to use on sli rendering mode" to 3 or 4 depending on how many gpus you want to run. - "nvidia predefined number of gpus to use on sli render mode" to 3 or 4 depending on how many gpus you want to run. - "nvidia predefined number of gpus to use on sli render mode on directx 10" to 3 or 4 depending on how many gpus you want to run. #7 Scroll down the settings list again until you find the section listed as unknown, and change the setting 0x10FD4C5F (7 profiles) to use 0x01F296C1. Scroll down more and change the setting 0x209FD306 (27 profiles) to use 0x0FC00008. #8 Click apply changes and your done. I also heard you might need to do the same for each game profile you're trying to run in sli if adjusting the base profile doesn't work. You may also need to set only 0x01F296C1, or 0x0FC00008, but sometimes you may need to set both under each individual profile.
post edited by Sajin - 2018/01/14 19:50:00
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bcavnaugh
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Re: 3 way SLI GTX 1080 Ti - how to do it?
2018/01/06 13:00:59
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Sajin
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Re: 3 way SLI GTX 1080 Ti - how to do it?
2018/01/06 13:05:29
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bcavnaugh
Maybe time for you to get two more EVGA GeForce GTX 1080 Ti K|NGP|N
This way you can update your How To Page with SLI How To.
I'll be sticking with 2-way from here on out as newer games are getting away from using 3 & 4 way.
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bcavnaugh
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Re: 3 way SLI GTX 1080 Ti - how to do it?
2018/01/06 13:08:31
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 WOW!
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Sajin
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Re: 3 way SLI GTX 1080 Ti - how to do it?
2018/01/06 13:10:03
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GunslingerOCS
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Re: 3 way SLI GTX 1080 Ti - how to do it?
2018/01/06 13:30:21
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Sajin
From what I have heard you have to...
#1 Have the correct sli bridge. Such as 100-3W-0032-LR for 3-way, or 100-4w-0042-LR for 4-way. Bridges without metal contact points won't work from what I have heard.
#2 Enable sli inside the nvidia control panel.
#3 Download the latest version of nvidia inspector, and open the profile inspector.
#4 Make sure you have the profile _global_driver_profile (base profile) selected.
#5 Click the button "show unknown settings from nvidia predefined profiles" to show all hidden profiles.
#6 Scroll down the settings list until you find the section listed as SLI, and change the setting "number of gpus to use on sli rendering mode" to 3 or 4 depending on how many gpus you want to run.
#7 Scroll down the settings list again until you find the section listed as unknown, and change the setting 0x10FD4C5F (7 profiles) to use 0x01F296C1. Scroll down more and change the setting 0x209FD306 (27 profiles) to use 0x0FC00008.
#8 Click apply changes and your done.
I also heard you might need to do the same for each game profile you're trying to run in sli if adjusting the base profile doesn't work. You may also need to set only 0x01F296C1, or 0x0FC00008, but sometimes you may need to set both under each individual profile.
Tried that route, unfortunately there is more to it. Even with that, GPUz still only shows 2x SLI enabled.
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Ranmacanada
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Re: 3 way SLI GTX 1080 Ti - how to do it?
2018/01/06 14:04:43
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https://www.youtube.com/watch?v=eyJyKtTt1rY This Russian youtuber said he only had to enable SLI in the Nvidia control panel, and nothing more. You also need a correct tri-sli bridge, as no every single one will work properly.
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CraptacularOne
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Re: 3 way SLI GTX 1080 Ti - how to do it?
2018/01/06 14:19:05
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Still going nuts with the GPUs huh Gunslinger?  One thing to check is your motherboard and more specifically it's PCi-E lanes available. I know some boards pull PCI-E lanes away from the slots when certain configurations of NVMe SSD's are used and in what ports they are used in. It may be pulling 4X lanes away from a PCI-E slot and as such SLI will not work as I'm sure you know SLI requires a minimum of PCI-E 8X to run.
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GunslingerOCS
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Re: 3 way SLI GTX 1080 Ti - how to do it?
2018/01/06 14:22:06
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Its a bench set up, single SSD, ASRock X299 OC Formula, 7980XE, plenty of lanes to spare. This is very frustrating
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Sajin
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Re: 3 way SLI GTX 1080 Ti - how to do it?
2018/01/06 14:27:44
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GunslingerOCS
Sajin
From what I have heard you have to...
#1 Have the correct sli bridge. Such as 100-3W-0032-LR for 3-way, or 100-4w-0042-LR for 4-way. Bridges without metal contact points won't work from what I have heard.
#2 Enable sli inside the nvidia control panel.
#3 Download the latest version of nvidia inspector, and open the profile inspector.
#4 Make sure you have the profile _global_driver_profile (base profile) selected.
#5 Click the button "show unknown settings from nvidia predefined profiles" to show all hidden profiles.
#6 Scroll down the settings list until you find the section listed as SLI, and change the setting "number of gpus to use on sli rendering mode" to 3 or 4 depending on how many gpus you want to run.
#7 Scroll down the settings list again until you find the section listed as unknown, and change the setting 0x10FD4C5F (7 profiles) to use 0x01F296C1. Scroll down more and change the setting 0x209FD306 (27 profiles) to use 0x0FC00008.
#8 Click apply changes and your done.
I also heard you might need to do the same for each game profile you're trying to run in sli if adjusting the base profile doesn't work. You may also need to set only 0x01F296C1, or 0x0FC00008, but sometimes you may need to set both under each individual profile.
Tried that route, unfortunately there is more to it. Even with that, GPUz still only shows 2x SLI enabled.
You're running the wrong sli bridge.
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CraptacularOne
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Re: 3 way SLI GTX 1080 Ti - how to do it?
2018/01/06 14:33:36
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GunslingerOCS
Its a bench set up, single SSD, ASRock X299 OC Formula, 7980XE, plenty of lanes to spare. This is very frustrating
I wasn’t sure you were using X299 and an i9. I’m on my tablet as it doesn’t show any signatures or specs in profiles. I would think then the SLI bridge you’re using is the culprit then.
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GunslingerOCS
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Re: 3 way SLI GTX 1080 Ti - how to do it?
2018/01/06 14:36:01
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I'm using the 3x bridge that came with the motherboard.
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Sajin
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GunslingerOCS
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Re: 3 way SLI GTX 1080 Ti - how to do it?
2018/01/06 14:46:26
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If that's the case, that is :censored: retarded. The bridge you have pictured is not even on EVGA's product page...
post edited by GunslingerOCS - 2018/01/06 14:48:41
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Sajin
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Re: 3 way SLI GTX 1080 Ti - how to do it?
2018/01/06 14:48:12
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GunslingerOCS
If that's the case, that is :censored: retarded.
I'm pretty sure that is the case. Have you checked to make sure all your gpus will sli with each other just to make sure the sli fingers are all in proper working order?
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GunslingerOCS
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Re: 3 way SLI GTX 1080 Ti - how to do it?
2018/01/06 14:49:04
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Sajin
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Re: 3 way SLI GTX 1080 Ti - how to do it?
2018/01/06 14:52:42
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GunslingerOCS
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Re: 3 way SLI GTX 1080 Ti - how to do it?
2018/01/06 15:24:25
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Vince says it's not the bridge. It's probably a motherboard PCIe bios setting.
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CraptacularOne
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Re: 3 way SLI GTX 1080 Ti - how to do it?
2018/01/06 15:26:18
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GunslingerOCS
Vince says it's not the bridge. It's probably a motherboard PCIe bios setting.
That’s why I told you to investigate the PCI-E lane allocations on your board
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Sajin
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Re: 3 way SLI GTX 1080 Ti - how to do it?
2018/01/06 16:38:09
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Looks like you have to have the cards in slots 1,5,7 for your board. The motherboard also comes with a 3-way bridge for that config.
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AHowes
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Re: 3 way SLI GTX 1080 Ti - how to do it?
2018/01/06 16:47:53
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And it looks like they will cook in the case.. I'd say have a large fan blowing at them with the side panel off.. if you end up keeping the setup long term id say no doubt water cool them.
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Sajin
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Re: 3 way SLI GTX 1080 Ti - how to do it?
2018/01/06 16:58:14
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Wow, that motherboard is whack. Both 3-way bridges aren't high bandwidth.  Note: You'll get higher scores using a high bandwidth bridge. I would suggest using the 100-4w-0042-LR bridge for the 1,5,7 config as the bridge should run at 650 MHz vs the 400 MHz bridges your board ships with.
post edited by Sajin - 2018/01/06 17:15:10
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CraptacularOne
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Re: 3 way SLI GTX 1080 Ti - how to do it?
2018/01/06 16:59:25
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AHowes
And it looks like they will cook in the case.. I'd say have a large fan blowing at them with the side panel off.. if you end up keeping the setup long term id say no doubt water cool them.
I know you don’t know who he is but rest assured they are not going to be air cooled for long.....
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GGTV-Jon
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Re: 3 way SLI GTX 1080 Ti - how to do it?
2018/01/06 17:15:12
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AHowes
And it looks like they will cook in the case.. I'd say have a large fan blowing at them with the side panel off.. if you end up keeping the setup long term id say no doubt water cool them.
I am going to pick on you here - didn'y you see the LN2 pot on the CPU in that picture - test bench rig
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GunslingerOCS
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Re: 3 way SLI GTX 1080 Ti - how to do it?
2018/01/06 17:15:32
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Sajin
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Re: 3 way SLI GTX 1080 Ti - how to do it?
2018/01/06 17:18:23
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Hope you saw my edit on post #24
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CraptacularOne
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Re: 3 way SLI GTX 1080 Ti - how to do it?
2018/01/06 17:25:09
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That's what I thought Gunslinger, its the lanes that's limiting you as it seems there isn't proper support for a 3 lanes with at least 8x going to all of them.
Out of curiosity are you running a PCI-E NVMe? You didn't specify whether or not when I mentioned it the first time. I'm asking again because the board may be pulling 4 lanes from one of your slots to feed the SSD. If so I'd suggest using a regular SATA SSD plugged into one of the SATA headers to test it and see if the lane allocation you need 8x8x8 appears in the bios.
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bcavnaugh
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Re: 3 way SLI GTX 1080 Ti - how to do it?
2018/01/06 17:27:34
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Sajin
Wow, that motherboard is whack. Both 3-way bridges aren't high bandwidth.
Note: You'll get higher scores using a high bandwidth bridge. I would suggest using the 100-4w-0042-LR bridge for the 1,5,7 config as the bridge should run at 650 MHz vs the 400 MHz bridges your board ships with.
That is because an HB Bridge cannot support 3-Way SLI
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