How to set different compute and video output card in multi GPU setup?

[vkristof01]

This is a prerequisite for LSFG and I have two 1080Tis but I can not distinguish them any way outside of GPU-Z or device manager, and even if a try setting which one of the two should be used for opengl or cuda in nvidia app or nvidia control panel or windows graphics settings, the computing is always done by the one with the primary display connected, if i switch the cable, the computing is immediately taken over by that card.

 

I did the registry edit (featured in most guides) to set one of them as the high performance adapter and guessed the hardware id of the desired card using the pci slot number, so i can select a "power saver" 1080Ti and a "high performance" 1080Ti in windows graphics settings, but it doesn't work.

[OddOod]

Welcome to the forums!
This is WELL over my head, but I'm interested in hearing if there's an answer.
One question I have is: Have you tried non-matching GPUs? If that's even allowed?

I assume you have used a guild like this
https://steamcommunity.com/sharedfiles/filedetails/?id=3347817209
or something similar

[vkristof01]

Hey,

Yes, i used that guide and one or two other. I couldn't do the second registry edit because there was three 1080Ti folder without any unique identifier inside.

Right, i should try a different card too, I have a Quadro and others, a couple years ago it happened to me with that card, that the games ran on that and the 1080Ti did the output, i wasn't happy of course.

[SorryBella]

6 hours ago, vkristof01 said:

This is a prerequisite for LSFG and I have two 1080Tis but I can not distinguish them any way outside of GPU-Z or device manager, and even if a try setting which one of the two should be used for opengl or cuda in nvidia app or nvidia control panel or windows graphics settings, the computing is always done by the one with the primary display connected, if i switch the cable, the computing is immediately taken over by that card.

 

I did the registry edit (featured in most guides) to set one of them as the high performance adapter and guessed the hardware id of the desired card using the pci slot number, so i can select a "power saver" 1080Ti and a "high performance" 1080Ti in windows graphics settings, but it doesn't work.

If you havent, please come and join Lossless Scaling discord server. Dual GPU LSFG especially with the same GPU chip brand is underresearched and we always need more sample. There might be someone that can pass by to help you to get dual GPU to work. THS also mainly take feedback from the discord server and his mail.

 

https://discord.com/invite/5cCP6aACgT

[Ravenger]

5 hours ago, OddOod said:

Welcome to the forums!
This is WELL over my head, but I'm interested in hearing if there's an answer.
One question I have is: Have you tried non-matching GPUs? If that's even allowed?

I assume you have used a guild like this
https://steamcommunity.com/sharedfiles/filedetails/?id=3347817209
or something similar

Hello!! If you want additional info on the concept of dual GPU LS, have a look at the Official Dual GPU Overview & Guide page I wrote on the Lossless Scaling Subreddit and Discord server.

As for the registry edit that this person is mentioning, they're on Windows 10, which doesn't have the option to select which GPU games run on integrated into its settings menu. The registry edit changes this one setting so that games run on the desired render GPU. And, indeed, that can get quite complicated when both GPUs have the same vBIOS (and are recognized as the same GPU model by Windows).

[vkristof01]

Thanks for the replies, solved.

 

By adding a different GPU i could figure out what's going on, and the second registry edit added (EnableMsHybrid) made them properly available in windows graphics settings (yes, before it was one of the 1080Tis twice).

 

Might check out the Discord. Initial impressions now with the correct setup is practically flawless but i only tried CP2077 yet.