Hey guys, i'm new here, but i have a question, when i'm playing msfs2020 and playing on london city, or Barcelona or more cities with a lot of details.

My GPU seems to be like on 10% usage and i have 5fps.

that's my specs:

GPU: rtx 4090

CPU: I9-13900K

RAM: 64GB 5600MHZ

MSFS IS ON MY SSD 4GENERATION 5000MB WRITE/READ SPEED

network 2.5gb download.

i forgot to mention that i play on 2560x1440 resolution, on ultra settings everything is maxed.

Welcome!
Just upvoting to see if anyone can help. 
Are you sure you've set the RTX 4090 as the graphics card, and not the graphics chip in your CPU?
Is this only in MSFS?

1 minute ago, Republic3D said:

Are you sure you've set the RTX 4090 as the graphics card, and not the graphics chip in your CPU?
 

That would be my guess as well.

And OP, check other software...maybe run a 3d benchmark or something just to make sure 3d is working well

Make sure the card is fully seated too.

Can you take a screenshot in dev mode with the FPS window visible and post it here thanks.

That will give people a starting point for diagnosis.

Edited December 5, 20223 yr by Glenn Fitzpatrick

well if you set lod to max.....

2 minutes ago, wim123 said:

well if you set lod to max.....

I have virtually the same machine specs, all ultra (or highest setting) and terrain LOD at 400 and am still getting over 90 fps over New York for example in full 4k, so it isn’t that. Hope he finds what it is.

here is a picture with developer fps

You are Mainthread limited. So this is a CPU problem not a GPU problem.

An i9 13900K and an RTX 4090 should not get those results. 

I'm guessing you've tried to reinstall the drivers?
Are you getting similar performance in other games, or is it just MSFS?
Is the 16-pin connector on your card fully seated, so your GPU is getting the power it needs?
Is the cooler on your CPU fully installed like it should be? 
What temperatures is it getting?
Is the CPU power cable from the PSU connected to the motherboard? 

Edited December 5, 20223 yr by Republic3D

4 minutes ago, Republic3D said:

An i9 13900K and an RTX 4090 should not get those results. 

I'm guessing you've tried to reinstall the drivers?
Are you getting similar performance in other games, or is it just MSFS?
Is the 16-pin connector on your card fully seated, so your GPU is getting the power it needs?
Is the cooler on your CPU fully installed like it should be? 
What temperatures is it getting?

As I pointed out in my earlier post with virtually the same equipment as OP, he should be generating very high frames. I wondered at first if his render scaling was set all the way up, but it appears he is actually under 100% there.  I’m also wanting to assume that this is a newly purchased PC in which case a call to the manufacturer may be in order.  Maybe the OP did the upgrade, and as you said something isn’t properly installed.

3 hours ago, Republic3D said:

An i9 13900K and an RTX 4090 should not get those results. 

I'm guessing you've tried to reinstall the drivers?
Are you getting similar performance in other games, or is it just MSFS?
Is the 16-pin connector on your card fully seated, so your GPU is getting the power it needs?
Is the cooler on your CPU fully installed like it should be? 
What temperatures is it getting?
Is the CPU power cable from the PSU connected to the motherboard? 

As Farlis said above, the problem is the CPU, not the GPU. Probably heating and throttling or other CPU problem.

4 hours ago, Alvega said:

As Farlis said above, the problem is the CPU, not the GPU. Probably heating and throttling or other CPU problem.

the cpu stay under 100% in this situation here is a picture:

forgot to add, other games run ok, only msfs2020 doing me this problems, and i know my pc, when he is working "hard" the fans going on turbo mod, which not happens here, he is still in quite mod.