SLI Problems with DK2, Runtime 0.8, Steam VR

SpyderHead

S
Hello everyone,

I've just bought a second MSI GTX 970 Gaming 4G, so I have two of these cards now.
The problem is, that the perfomance without SLI is quite the same or even a little bit better as with SLI activated when I'm using my Rift DK2.
For expample, with SLI activated and using the DK2 I get around 30 to 45 FPS inside the docking bay. Whit SLI deactivated and using the DK2 I get around 35 to 55 FPS inside the docking bay (high details with supersampling set to 1.5). MSI Afterburner shows me about 60% usage on the first GPU und about 50% usage on the second GPU. Without SLI GPU1 is at 99% and GPU2 is at 5%. I also made some tests before I've installed the second GPU and compared to the real single GPU setup, the FPS are quite the same with SLI.
But this only happens while using the DK2. When I'm playing on my monitor (without VR) SLI works very well and I get the expected performance boost with SLI. Afterburner shows me around 90% usage on both GPUs.

My hardware configuration:
Motherboard: ASUS Maximus VII Hero (Z97)
CPU: i7 4790K
GPU: 2x MSI GTX 970 Gaming 4G
RAM: 16GB DDR3-1600 (Kingston HyperX Predator Beast)
HDD: Samsung 850 Pro SSD

Current software:
Oculus Runtime 0.8
Steam VR
Elite Dangerous Horizons (actually 2.0.03)
Windows 10 64 Bit (no upgrade-version)

What I've already tried:
- Re-Installed nVidia drivers (removed the old ones first)
- Re-Installed Oculus Runtime
- Re-Installed SteamVR
- Installed actual beta-version of Steam VR
- Tried to install Oculus Runtime 0.5 and 0.6 (in both cases my graphics driver can't be loaded and also the Rift is not working respectively recognized). I've installed the runtime through compatibility mode and as admin. I've also tried the driver version 350.12 here, but that doesn't change anyting. No graphics card driver and no Rift here
- Tried to change SLI mode for ED, Steam VR Server and Steam itself (Tried mode 1, mode 2 and default mode)

I hope some of you guys can help me as I don't know what else I can do, expect of selling these two cards and to buy a 980 Ti. Or to wait for the CV1 and to hope, that FD brings back native Oculus support.
 

Lestenio

L
Same issue, same spec.
bought myself a second 970 last month, in SLI fps is low and both cards are hardly working.

to get good results I had to not SS and use mostly low setting. Especially terrain quality. It was the only way to get 75fps in stations and on surfaces
 

Dread Lord

Dread Lord
I think you have to wait until the dedicated VR SLI Comes out which is specifically designed so that each Card renders one Screen! Right now SLI doesnt really work properly with VR Headsets... I expect it to be ready when the CV1 hits consumers in march... lets hope so anyway!
 

Dread Lord

Dread Lord
yeah but not properly in the sense that it wasted a lot of resources - VR SLI is different and will be worth waiting for!
 

Beavis Tingleball

Beavis Tingleball
my pc is fitted with 2 msi gtx670's. with Sli disabled, I get great framerates everywhere with high settings, SS off. With SLi enabled, I get smooth framerates on high but am able to use 1.5 ss.. come on already with the Gameworks! If I were FD, Gameworks implementation would be preyyt high up on my list of things-to-do. ED is a great game but it's even way more betterer in VR.
 

SpyderHead

S
Pixelpowder said:
Have you tried enabling SLI via Nvidia Inspector?

https://www.reddit.com/r/EliteDange...how_to_get_sli_working_in_the_horizons_beta/z
Click to expand...
Thanks for the link. I've tried it, but unfortunately it doesn't change anything. Still got the same effect that the FPS are a little bit lower when using SLI and the GPU usage still is between 50% and 60% on both cards.

The good thing is, I've found out, that I don't have to change the resolution inside Windows to get 75Hz. It also works setting only ED to a lower resolution and set it to fullscreen mode to have the option of 75Hz inside ED.
 

SpyderHead

S
Finally I've got it.

I've found a little RTU package on Reddit that provides the possibility to switch between the runtime 0.5 and 0.7 (but it also works with 0.8). So you just have to install 0.8, download and extract that package, copy two files into the windows folder and there you are.
Here's the link to the discussion about that package on Reddit:
https://www.reddit.com/r/oculus/comments/3paivl/rtu_package_to_switch_between_oculus_07_and_05/

Thanks to that package I can switch to 0.5 now and enjoy ED in VR with a working SLI setup :cool:
 
Last edited:
You must log in or register to reply here.
Back
Top Bottom