Hello all, 

In mid-July I built a PC for the first time, here are some basic specs:

Ryzen 9 7950x3D

MSI RTX 4080 Super Suprim X

G. Skill Ripjaw 2x32 GB DDR5-6000 CL30

Samsung 990 Pro 4TB PCIe 4.0 NVME

Here's a link to the full build for anyone who's curious: 

This is absolutely a strong build for flight simulation, but I'm a little concerned that 16GB VRAM may not be enough when I'm running a whole host of top addons in P3Dv5.4 (PMDG, Aerosoft, LatinVFR, ORBx, etc). I have my settings mostly maxed out and get above 40 fps during cruise and somewhere between 25-40 fps near and on the ground, depending on where I'm at. I really enjoy doing alot of flights in a row, regardless of length. For example, yesterday I flew from TNCM to KBUR, which achieved VRAM of 11.1 out of 14.9GB. I then flew from KBUR to KOAK thereafter and got a Device Hung Error right after TOD while VRAM was at 10.9 GB. My CPU is performing like a dream and GPU utilization is very consistently above 85% and stays in the 90s a lot. 

What exactly is going on here?

• Is my CPU outpacing my GPU?
• Is something in P3D the issue?
• Should I have gotten an RTX 4090 instead?

I'm happy to provide any additional info that may be helpful. For Northern America, I basically have all the major scenery addons from Orbx and a whole host of airports throughout the country. Dynamic Lighting does hit FPS, but it remains at a consistent level, which I would assume means the PC is perfectly capable of achieving high to ultra settings. 

 

Thank you, all

 Try different Nvidia drivers until you find one that works well and that also doesn't give you device hung errors. What works for others with 10 identical systems might not work for you or anyone else for that matter. It all comes down to each build it seems.

Just a thought:

Close P3d after each flight and restart it for a new flight.

Check if the memory used is different.

Pierre

Each P3D version release has more pushed over to the GPU so I would expect more GPU resources to be used, espeically if maxing out GFX settings.

I personally have also managed to max out my GPU's usable memory in both P3D v4.5 & 5.3 (have a 12 GB 3080Ti).

Use of High res textures and PBR will consume more resources.

Are you running DynamicTextureStreaming and/or TEXTURE_SIZE_EXP=10 ?

Cheers

2 minutes ago, Rogen said:

Each P3D version release has more pushed over to the GPU so I would expect more GPU resources to be used, espeically if maxing out GFX settings.

I personally have also managed to max out my GPU's usable memory in both P3D v4.5 & 5.3 (have a 12 GB 3080Ti).

Use of High res textures and PBR will consume more resources.

Are you running DynamicTextureStreaming and/or TEXTURE_SIZE_EXP=10 ?

Cheers

Hello Rogen, 

I'm not running either of those two things. Is it fair for me to say that the GPU is bottlenecking and not the CPU? I'm wondering if it makes any sense to plan to sell off the 4080S and apply that towards a 4090 if it can keep up with the demands of the sim and complement the CPU well. I really love the way the sim looks with high res and PBR. 

1 hour ago, ppo said:

Just a thought:

Close P3d after each flight and restart it for a new flight.

Check if the memory used is different.

Pierre

I'll let you know, thanks! I'm currently flying through the Detroit area at FL390 on a route from KOAK to KJFK. Cruise FPS are 35-60, VRAM is 9.3GB, CPU is operating at 5.0-5.3 GHz, and GPU utilization is 95% when rendering and goes down to 45-60% when chilled out. I plan to continue on to EGLL, so I'll reload the sim and report back on what happens tonight. 

Also, I'm flying the PMDG NGxu BBJ 

Edited September 18, 20241 yr by Amrick615

1 hour ago, Dave_YVR said:

 Try different Nvidia drivers until you find one that works well and that also doesn't give you device hung errors. What works for others with 10 identical systems might not work for you or anyone else for that matter. It all comes down to each build it seems.

I have it at the latest driver. Is there a procedural way to narrow down which driver will work for me, or is it purely trial and error? What do I do when a new driver comes out? (try it and revert back if the problem comes back?)

2 hours ago, Amrick615 said:

and got a Device Hung Error right after TOD

Have you seen the locked topic at the top of this page?

https://www.avsim.com/forums/topic/609730-dxgi_error_device_hung-solution/

 

1 hour ago, Ray Proudfoot said:

Have you seen the locked topic at the top of this page?

https://www.avsim.com/forums/topic/609730-dxgi_error_device_hung-solution/

 

I saw this but didn't apply it since the post was from 2021. I figured by now MSI would have implemented a solution to direct 12 compatibility. Is this still a valid solution that I should follow?  

I run a 4080, and the only time I even run close to running out of VRAM is with the TFDi MD-11.  I also push the GPU pretty hard, and I only have a 9700K.

I use:

4K textures

7cm textures

4X SSAA

Ultra Shadows

TEXTURE_SIZE_EXP=10

2560X1440 Resolution.

 

I don't think you problem is VRAM related.

2 hours ago, Amrick615 said:

I figured by now MSI would have implemented a solution to direct 12 compatibility. Is this still a valid solution that I should follow?  

Nothing to do with MSI, it's an Nvidia thing.

8 hours ago, Amrick615 said:

Is this still a valid solution that I should follow?  

Try it. It’s easy enough.

8 hours ago, exeodus said:

don't think you problem is VRAM related

I don't either. Also using the 4090 and haven't used more than 1/3 of vram so far. I use the nvidia studio reference driver which gives me great stability in every app /sim /game at the cost of 1 or 2 fps so I can't mess with that. 

I'm wondering if p3d cleans up correctly (v5. 4) after shutting down as I persistently had the issue within minutes of loading the a2a p51 with rxp gtn 650 over and over until I logged off Windows to refresh the session and was instantly stable again. 

Hello Everyone, 

I highly appreciate all of your inputs. I believe my problem was closely related to my overclock settings. I had my CPU's curve optimizer set to -15 on all cores and some other limits to wattage, etc. In addition to that, I used MSI Afterburner's auto-OC mode, which put my GPU's core clocks up to 2850MHz and memory at +200MHz. I reset these all to default and just did 3 long haul flights in a row without issues. I do want to be able to use my CPU and GPU to their fullest, but I think I need to go back to the drawing room before I can consider overclocking anything yet. 

If anyone has some basic tips on what I can expect out of my PC, I'm happy to learn! At least I am back to a safe square-one. 

 

Thank you again. 

Hello Everyone, 

So far no issues with the sim. What I do want to know is would there be any real difference in performance if I upgraded to a 4090? I don't really see anyone compare the 4080S and the 4090 to each other for P3Dv5. If my GPU is posting high utilization, then does that meant there is headroom to be had? (The way I understand is high GPU utilization = more available from the CPU, therefore it can better utilize a more powerful GPU). 

 

Thank you,