Vulkan SLI?

[Witblitz]

This is probably a crapshoot but I have to ask. The funny thing is I get better performance now with Single GPU Vulkan than I previously could with OpenGL with SLI. So at least the game does actually run much better now with Vulkan, but it would be a dream to get that second card going!

When I try to force SLI the framerate drops to 7fps. Turn it off and it's back to 60fps. Go figure.

[Witblitz]

No one out there cares about SLI not working? Or am I missing something?

[Dukmiester2]

I had to turn SLI OFF completely to get it to be even playable. With Vulcan and the experimental branch, if SLI is enabled and in the NVIDIA control panel the No Mans Sky profile is set to "Single Gpu", I get a whole 4 (that's FOUR) FPS!

Unacceptable to have to turn SLI completely OFF in the Nvidia control panel to even get the game to be playable.

On stable branch, I run SLI enabled and have the No Mans Sky profile set to "Alternate Frame Rendering 2" and I have a near stable 60 FPS, with occasional dips to 45 or 50.

On experimental with SLI completely disabled and the in-game Vsync set to "ON", I get a whole 30 FPS. Switching the in game Vsync to triple buffer I am still only able to get 35 to 50 FPS.

I sent a ticket to HG, but forgot to attach my DXDIAG to the ticket.
I did describe the problem, in detail, about how this new Vulcan implementation has completely borked SLI, so hopefully they can get this sorted BEFORE they roll this out to the stable branch.

I am NOT willing to disable SLI just to play No Man's Sky.

My specs for comparison:

Win 10 Pro 64 bit
Asus ROG Strix X470-F Gaming Mainboard
AMD Ryzen 2700X CPU
Corsair 32gig Vengence 3000Mhz DDR4 RGB RAM
2x eVGA GTX 1070 SC 8GB SLI
Geforce Driver 425.31
Asus MX279 27" IPS Display @ 1920x1080

[Witblitz]

I also have to disable SLI completely before the game runs smooth. I ran DDU and re-installed 425.31 and also resetting my nVidiaInspector bits to default, etc.

The minute I enable SLI the framerate drops to 7fps, trying to find info as I understand Vulkan 1.1 does support multi-GPU, whether that is different to SLI, who knows.

Contemplating whether I should open a ticket, I just hope they manage to add SLI support as well. That would be killer as I can already see the game running much better on this API.

[MonkeyGamesVR]

Originally posted by Forza SF90:

No one out there cares about SLI not working? Or am I missing something?

yep, nobody gives a bunch! :P

[MadDoggyca]

SLI and CROSS FIRE

ONLY WORK ON DX9.c and newer..

Im positive that OpenGL can not be SLI/CF unless you force it via your graphic Control panel.. and that can creat a hole lot of other issues|


you would have the same issue with other OpenGL titles like Xplane 11 for example..

Im not sure if Vulkan has native SLI/CS or is on the same boat as OpenGL with zero SLI/CS support... /shrugs

Thats a API limitation.. and even HG couldn't fix that...


SIDE NOTE

Multi-GPU is not SLI/CF..
Multi-GPU is a API level tech (Vulkan 1.1 & DX12) that lets multi GPU from multi manfactors (NV/AMD) to combine gpus into one workload... theres only one title to date that uses this feature (ashes of singularity)

the big diffrence between old SLI/CS vs MGA (multi-gpu-Adators) is the cards are not "mirrored"

SLi/CF mirrores the GPU Vram were MGA combinds them

So SLI 2x1070 8g becomes 2xgpu @ 8gig
DX12 MGP 2x1070 becomes 2xgpus @ 16gig (cards act as one but stay indepentally from each other, which is why u can combin a GTX 1070 with a Vega 56 for example

[Witblitz]

Guess I'll just have to play it on my PSVR then. Screw it.

[ItaliaUno]

I was searching for a Vulkan crossfire support... but seem to be useless to add a second card for this game