Cant enable SLI

[ScottWood]

When I go to enable SLI it will do so, then toggle back instantly.

 

Both cards are good so is the bridge, drivers have been reinstalled and its a fresh copy of widows, only thing that has changed is the CPU and motherboard, both support SLI with latest BIOS. 

[WhitetailAni]

Specs of your current system and specs of your old system?
Which cards do you want to run in SLI?

[ScottWood]

Just now, FakeKGB said:

Specs of your current system and specs of your old system?
Which cards do you want to run in SLI?

Old was Threadripper 1950X with Zenith Xtream motherboard.

 

New is Ryzen 7 5800X with Asrock Taichi 570X

 

The cards are 2 MSI SeaHawk X 1080TI 

[WhitetailAni]

1 minute ago, ScottWood said:

Old was Threadripper 1950X with Zenith Xtream motherboard.

 

New is Ryzen 7 5800X with Asrock Taichi 570X

 

The cards are 2 MSI SeaHawk X 1080TI 

So when you hit "Enable SLI" it simply disables it instantly?

[ScottWood]

Just now, FakeKGB said:

So when you hit "Enable SLI" it simply disables it instantly?

Screen will flicker, it will show its applying then go back to disabled. 

[Grabhanem]

Dumb question: are you using the top two slots? The bottom one doesn't have enough bandwidth for SLI.

[Guest]

If you check GPU-Z, do both cards read as their proper PCIe x16/x8?

Check to make sure one isn't running at like x4 or something strange.

[ScottWood]

Just now, Grabhanem said:

Dumb question: are you using the top two slots? The bottom one doesn't have enough bandwidth for SLI.

Yeah using the top 2 16X. 

 

1 minute ago, Den-Fi said:

If you check GPU-Z, do both cards read as their proper PCIe x16/x8?

Check to make sure one isn't running at like x4 or something strange.

 

If i read that right does it mean the slots are at 8X? isnt that right for SLI?

[Guest]

7 minutes ago, ScottWood said:

Yeah using the top 2 16X.

If i read that right does it mean the slots are at 8X? isnt that right for SLI?

Hmm, yeah. You're fine.

Try running DDU to completely remove the driver and re-install it (or the previous driver version)

[ScottWood]

6 minutes ago, Den-Fi said:

Hmm, yeah. You're fine.

Try running DDU to completely remove the driver and re-install it (or the previous driver version)

That was my first step D: 

 

I had a thought, I didnt take into account pcie lanes on the CPU i think i may be maxing this one out.

[Guest]

Just now, ScottWood said:

That was my first step D: 

 

I had a thought, I didnt take into account pcie lanes on the CPU i think i may be maxing this one out.

 

Eh, this started out as a 3900X and had 2x 2080s and both ran find at 8X, so I doubt it.

[ScottWood]

6 minutes ago, Den-Fi said:

 

Eh, this started out as a 3900X and had 2x 2080s and both ran find at 8X, so I doubt it.

I also have 2 nvme 4x drives, ive just removed one and now I cant detect the 2nd Gpu -_-

[ScottWood]

Re-installed drivers again, can see the 2nd GPU, same issue with SLI 

[Guest]

5 minutes ago, ScottWood said:

Re-installed drivers again, can see the 2nd GPU, same issue with SLI 

You could try installing something like folding@home and see if it addresses both GPUs.

[ScottWood]

2 minutes ago, Den-Fi said:

You could try installing something like folding@home and see if it addresses both GPUs.

They show up in everything just cant enable it, even on the GPU-Z test render

 

[Guest]

Here's a good thread. Start here.

https://forums.evga.com/3-way-SLI-GTX-1080-Ti-how-to-do-it-m2748218.aspx

[ScottWood]

8 hours ago, ShrimpBrime said:

Here's a good thread. Start here.

https://forums.evga.com/3-way-SLI-GTX-1080-Ti-how-to-do-it-m2748218.aspx

No joy with that, Also tested with another bridge. 

[ScottWood]

Just going to update this for the sake of it.

 

Got it working, Kinda mad how dumb the fix was.

 

Install the drivers then reboot, then installed the drivers again.

 

Saw it on another forum.... weird but works