RTX 3090 low performance

[goliat26]

Hello.

Few days ago i bougth RTX 3090 (change from RTX 3070) especially for DCS. Rest of my CPU is i7 8700k, 16 GB RAM and M2 NVME SSD for system and another NVME SSD for games. I use HP Reverb G2 for VR.

Before i get RTX 3090 i used Oculus Rift S with RTX 3070. It was very smooth on High preset in VR. Then i change GPU for RTX 3090 and googles for Reverb G2 and High preset is unplayable. Max 40 fps and its too low for me because i fell sick when i see stuttering... I was hoping for at least 50fps and now i am dissapointed. I tried steam VR and OpenComposite with OpenXR tool. No difference in fps.

Here are my settings in DCS



And here is screen from Windows process manager


And FPS counter in game


As you can on process manager screen, GPU works on 100% and CPU on about 40% with sometimes pick to 90%.

Can you give me any advices to boost fps? Or meaby RTX 3090 users can tell me if it is normal FPS for this card?

Edited November 17, 2022 by goliat26
goggles

[Baldrick33]

Do you still have the Rift S to test how the 3090 compares with the 3070 with the same resolution settings. By default the G2 will be set to significantly higher than its native 2160x2160 resolution. What resolution was the Rift S running at?

by comparing Rift S & 3070 with G2 & 3090 you have introduced a number of variables, WMR, SteamVR or OpenXR, different resolutions  etc. all which can require tuning.

[HiJack]

Driver cleaning?

[Mike_Romeo]

24 minutes ago, goliat26 said:

CPU is i7 8700k, 16 GB RAM

Bottleneck ?

[goliat26]

17 minutes ago, Baldrick33 said:

Do you still have the Rift S to test how the 3090 compares with the 3070 with the same resolution settings. By default the G2 will be set to significantly higher than its native 2160x2160 resolution. What resolution was the Rift S running at?

by comparing Rift S & 3070 with G2 & 3090 you have introduced a number of variables, WMR, SteamVR or OpenXR, different resolutions  etc. all which can require tuning.

Yes i have Rift S but i uninstall Oculus Drivers but i can install them again. Rift S has way lover native resolution 1280x1440 vs 2160x2160 in G2.
With Rift S i had Pixel Density on 1.5 value, now i have on 1.
 

 

6 minutes ago, HiJack said:

Driver cleaning?

I use Geforce Expirience to install drivers. Do you think that totally drivers cleaning and install again will help?

Edited November 17, 2022 by goliat26

[edmuss]

In comparison to the rift s you're pushing approximately 540% the number of pixels at 100%. You will not sustain the same settings.

You're also going to be bottlenecked by the CPU quite severely. Also ram is too low really, running mem cleaner when flying will help.

Running a 3080ti I can get 60-85fps but I have a 5800x3D to push it along fast enough.

Drop the resolution to around 2800 wide, reduce visibility, water and clouds to medium. Turn off the reflections and ambient occlusion and traffic to low or off.

Have a look though my openxr tuning guide for some baseline ideas for setting it up and you should be good. You need to be looking at a motherboard, CPU and ram upgrade fairly soon though.

edit: you also need to have your system in absolute tip top condition to make the most of your hardware. Follow Thud's VR4DCS guides to the letter and don't skip a thing.

Edited November 17, 2022 by edmuss

[goliat26]

3 minutes ago, Mike_Romeo said:

Bottleneck ?

How it can be bottleneck if CPU is used only in 50%?

[HiJack]

Well if you ask for help you get replys. Thats the deal. Try DDU is the first thing I would run. But you decide what to do of course.

[edmuss]

The CPU can't process the data from DCS fast enough, 50% just shows that half of the cores are loaded. Imagine trying to force a river through a hosepipe, that's what DCS is trying to do.

[PLUTON]

you say that are G2 does not run at its native resolution 2160X2160! What setting is needed for a G2 to be at its native resolution please?

[edmuss]

3160x3160 is the render resolution to run the G2 at 100%

[goliat26]

3 minutes ago, edmuss said:

Have a look though my openxr tuning guide for some baseline ideas for setting it up and you should be good. You need to be looking at a motherboard, CPU and ram upgrade fairly soon though.

Running a 3080ti I can get 60-85fps but I have a 5800x3D to push it along fast enough.

 

I have this in near future plan. i7 12700kf in plans with 32 GB DDR4. Can you show me your settings?

 

1 minute ago, HiJack said:

Well if you ask for help you get replys. Thats the deal. Try DDU is the first thing I would run. But you decide what to do of course.

I will try it.
 

[PLUTON]

Thank you for your reply
so if 3160X3160 corresponds to 100%
2160X2160 corresponds to?

[edmuss]

About 40% I think, the display panels are 2160 but you need to render higher and mush the pixels together to account for lense distortion.

[PLUTON]

OK
so I have to stay set at 100% and not at 40%
to be at the native resolution of the G2
(because I guess it won't work better if I use the native resolution of the headset!)

[Burt]

The bottle neck calculator is saying your 8700 is to weak for the 3090.

https://pc-builds.com/bottleneck-calculator/

[jurinko]

Put sslr, ssao and cockpit illumination to off. 

[speed-of-heat]

Turn off sslr and ssso, shadows to medium, clouds to medium terrain shadows to flat

[HiJack]

8 minutes ago, goliat26 said:

I have this in near future plan. i7 12700kf in plans with 32 GB DDR4. Can you show me your settings?

 

I will try it.
 

It's worth a try but the info on bottleneck seems legit. Anyway I would try the DDU before caving in and buying a new mainboard and CPU. Tha 3090 should of course be much more powerfull than the 3080. I'm interested because I'm looking to upgrade my setup as well. Good luck finding the right solution.

[speed-of-heat]

And global cockpit illumination as well turn it off

[HiJack]

14 minutes ago, Burt said:

The bottle neck calculator is saying your 8700 is to weak for the 3090.

https://pc-builds.com/bottleneck-calculator/

That is a good link, thanks! But this calculator does not take in to account any overclocking you can do on the CPU level. Just to keep that in mind...

[Burt]

Agree HiJack ! 

I also have my Secondary Shadows disabled for the time being. 

[goliat26]

My settings at this moment.

I tried this few minues ago. 45-60 FPS depends on trees etc...
When i look ahead its not bad. But when i fly on low altitude and look at houses and trees on left or right then i see powerpoint presentation :(.
Houses move every 10 meters every frame.

[Baldrick33]

I use motion reprojection on always in OpenXR (or previously on auto using SteamVR). For me it makes 45fps or even 30fps much smoother.

[edmuss]

The only way to stop that is to turn on reprojection (which is currently suboptimal image quality in openxr) to smooth it out or beat refresh rate.

What you're currently doing is relying on the runtime vsync to try to smooth things out, basically you're only displaying frames at half the refresh rate (45fps). Rotational head movements will feel smooth but fast moving things close by will be jumping.

Beating refresh rate syncs everything together and the image is completely clear and all motion is smooth. At 90hz you're not going to do it but you have a chance at 60hz (if you can handle the refresh rate flicker), however you need to be consistently above 60fps otherwise it gets really uncomfortable relying on 30hz vsync.