Poor Performance with NVIDIA 4090

[elee 46]

Hello, guys, with all the enthusiasm in the world, this weekend I have changed my old AMD 5770 xt GPU for the monster of the moment, the Nvidia 4090.

However, the disappointment could not be greater. I don't get adequate performance and I dare say it's almost worse than what I had with my old GPU.

The tests that I have carried out are in factory airports such as KJFK, KBOS, KLAX, with heavy air traffic. And I can't get past 20 FPS. Stuttering is horrible, things I didn't have with my old GPU. When I remove the air traffic from the airports, I manage to get up to 30 FPS, but this doesn't make any sense. Seeing in the headlights the performance of other colleagues with a 4090, they exceed 60 FPS. The strangest thing is that the GPU almost never exceeds 10% load, the temperature stays below 50 C. The CPU also stays below 10% and low temperatures.

Another interesting thing is that it doesn't make any difference to FPS in an Ultra or Low mode. The change of the LOD or Objects between 10 and 400 is not so significant either.

Please, I know you are quite tech savvy and can you help me identify if any of my settings are wrong, eg monitor resolution vs GPU etc.

Software

- MSFS 2020 version 1.29.22.0 (Beta)

MSFS Configuration

- Display Mode = Full Screen

- Full Screen Resolution = 3840x1080

- AA= NVidia DLSS Super Resolution

- NVidia DLSS SR = Quality

-AMD FidelityFX = 50

- V-Sync = OFF

- NVIDIA Reflex Low Latency = ON

- HDR10 = ON

- Directx V. = DX12 (Beta)

-Global Rendering Quality = ULTRA

- Terrain Level = 200

- Item Level = 200

Samsung 49 Inch Curved Monitor

- 3080x1080

- FreeSync = OFF

- Refresh Rate = 144Hz

NVIDIA Gigabyte 4090 Card

- Driver = 522.25 Geforce Game Ready Driver

- IMPORTANT: I have only connected 3 of the 4 power supply connectors. My power supply is 850 W and it doesn't have another additional connector, but I understand that you only need 3 at least and that the fourth one is for OC issues.

Computer hardware I'm not going to go into much detail, but I can guarantee you that everything is state-of-the-art.

- CPU = i9 – 11900k @3.50Ghz

- RAM = 64 Gb

- Power Supply = ASUS 850 W

- Motherboard = ASUS Maximus Hero XIII

Windows

- version 11 Home with daily updates

- Game Mode = OFF

- Virtual memory enabled as per recommended guides

[Mace 1,904]

I'm at work and don't have time to respond in detail, BUT my main point would be that you are cpu bound.  This will inhibit what top-end you can see.

Also, give it a couple of sessions and see if your performance doesn't improve.  I noticed that with my 1080ti to 3080ti upgrade.  I don't know if shaders get rebuilt or what goes on.

[pemigris 31]

3 minutes ago, elee said:

 

- IMPORTANT: I have only connected 3 of the 4 power supply connectors. My power supply is 850 W and it doesn't have another additional connector, but I understand that you only need 3 at least and that the fourth one is for OC issues.

 

Hi, from where do you have this information?

I have the same card and had to buy new power supply as my existing one had also 'only' 850W' but with all four connectors attached. The card slowed down and stuttered periodically when its utilization went above 60%

[Ricardo41 5,948]

16 minutes ago, elee said:

However, the disappointment could not be greater

I've said it a million times: throwing expensive hardware at MSFS isn't going to do much. 

People don't believe me. People continue to waste money at overpriced hardware. Nvidia thanks you. 

[rutrA 282]

In my opinion You need a least PSU 1000W. 

[David Mills 4,753]

It's almost invariably the simmers with ultra high-end systems who report all the performance problems, because they overdo all their graphics settings by a mile, believing they shouldn't have to compromise after their expensive purchase.

[Noncon 19]

Running a 4090 (or even a 3090) at 1080p is not the best use of this card.  At this resolution, and using the same processor as your previous GPU, I wouldn't expect much of a fps boost.

[Lange_666 167]

It's 1080p vertical but double horizontally at 3840 so the 4090 should do just fine.
 

But this worries me a bit...

57 minutes ago, elee said:

- IMPORTANT: I have only connected 3 of the 4 power supply connectors. My power supply is 850 W and it doesn't have another additional connector, but I understand that you only need 3 at least and that the fourth one is for OC issues.

 

[MySound 403]

OP is running 4K. 
@elee can you run something like 3D Mark to check if everything is ok in general?

[MySound 403]

4 minutes ago, Lange_666 said:

 

But this worries me a bit...

 

No OP is right. 150w (I think) per connector. At least der8auer did it like this. 
 

https://www.tomshardware.com/news/geforce-rtx-4090-power-adapter-hack-to-draw-600w-from-just-three-8-pin-plugs

Edited October 17, 2022 by MySound

[Noel 4,492]

59 minutes ago, Mace said:

_{I'm at work and don't have time to respond in detail, BUT my main point would be that you are cpu bound.  This will inhibit what top-end you can see.}

_{Also, give it a couple of sessions and see if your performance doesn't improve.  I noticed that with my 1080ti to 3080ti upgrade.  I don't know if shaders get rebuilt or what goes on.}

Can use Disk Cleanup to delete the DX shade cache files.  Yes, CPU bound beyond belief.  Plus, he's at 3.6Ghz and depending on turbo boost.  Why not o/c all cores to 5.0Ghz?

 

[sidfadc 1,344]

My GTX 1070 and i7 4790k running at 30 FPS (mostly) is smirking in the corner....

 

 

 

 

joke

[TravelRunner404 596]

It's likely something in your community folder, the plane you are using, and/or SU11 (Beta) having a conflict or bug.

There are three things we need to know to offer you any advice that doesn't involve power supply guesses or NVIDIA bashing.

1. Take a photo of your community folder and post it, or at the least list everything that's in there.

2. Go into the game and once you are in the scenario where you see poor performance turn on Developer Mode (Esc-Settings-General-Developers-Developer Mode ON).  When that screen comes up there are three timings you need to note: Mainthread, rndrthread, and GPU.  Note the miliseconds for each.

3. Open task manager and show us a list of processes that are running while you are in this scenario to make sure nothing is hogging resources. Of course be careful not to screenshot any sensitive or personal information both in your community folder and task manager.

Most likely one of your mods or planes is conflicting but rending 3.3 million megapixels with the 4090 is like driving a Ferrari on the 405 at rush hour and expecting to get your destination sooner.

[ryanbatc 12,833]

6 minutes ago, sidfadc said:

My GTX 1070 and i7 4790k running at 30 FPS (mostly) is smirking in the corner....

 

 

 

 

joke

You almost got me HAHA

[David Mills 4,753]

6 minutes ago, sidfadc said:

My GTX 1070 and i7 4790k running at 30 FPS (mostly) is smirking in the corner....

 

 

 

 

joke

Same hardware here as @sidfadc. Same smirk. Most people overdo their graphics settings.