MSI X570 Godlike - Can't enable SLI in Nvidia Control Panel

[Toshibitsu]

Hello,

I was using an i9-9900k w/ a Z390 board and 2 3090's in SLI/NVLink with the help of dual GPU riser cables.
I recently acquired a 5950x and got the MSI X570 Godlike board. I did a clean install of Windows 10 and followed the manual's instructions to place the cards in PCI_E1 & PCI_E3(which also happens to be the only configuration that is compatible with the 4-slot spacing for the 3090 NVlink). All drivers/updates have been processed and the system recognizes both 3090's(no errors in Device Manager either). When I go into the Nvidia Control Panel, it shows that SLI is disabled. If I try to enable SLI, it attempts to(screen flashes), then just reverts back to "SLI disabled":

I did notice at least in the BIOS, it's showing something that seems odd to me. Under the PCI_E1 & E3 lanes, it only allows me to choose "Auto" or "x4+x4":

Also, under 'Board Explorer', it's showing that both the PCIe x16 & PCIe x8 slots are both running at x8which is what is supposed to happen):

As you can see, this is setup correctly:

That and I've made sure to follow these directions as well:

I am at work currently, but am going to try DDU & re-install the video driver again.

Other than that, I do have an NVMe installed in M.2 Slot #1 as well as M.2 Slot #2. According to the manual, both of these slots are controlled by the chipset, whereas M.2 Slot #3 is controlled by the CPU:

Is it possible that the M.2's are conflicting with the PCI_E lanes? I also have 3 2.5" SSD's in SATA slot #2, #4 & #6.

thank you

 

[citay]

The GeForce RTX 3090 has no nominal SLI support (no "implicit SLI"), it has only "explicit SLI" support. This was first mentioned in the driver release notes 456.38:
http://us.download.nvidia.com/Windows/456.38/456.38-win10-win8-win7-release-notes.pdf

This is further explained in the KB article:

NVIDIA Support

nvidia.custhelp.com

SLI - as people used to know it - is basically over. Crossfire and "real" SLI have failed because they mess with the rendering pipeline, which leads to problems in modern games and game engine development. Since SLI was rarely used even in its heyday, there was little incentive to make it work properly, and eventually too many modern games appeared where those technologies won't work anymore.

NVIDIA has demonstrated - by limiting SLI to the highest models 2080, 3090 - that they have little interest in SLI for the masses. Because if SLI worked well with any card, you could take two cheap cards and replace one expensive 3090 with it. But that's completely against NVIDIA's business model, where you have to pay exponentially more for a top-end card to get that last few percent of performance.

So now they leave it completely up to the game makers to implement some sort of SLI support. This won't have much future either. Again, not enough users to warrant the development time.