I got the following system: 

RTX 3080
Ryzen 7 5800x
32GB Ram
NVME ssd

I play@ 3440x1440 or with an Index with 100% resolution scale.   A few times now, I noticed that my FPS absolutely tanks randomly and when I look at the VRAM usage it is completely full. I only had it while using the Fenix A320, but that could be coincidence, since I didn't use other planes much since the issue occurred. Settings on flat were High/ultra, but I lowered all those ultra ones to high. On VR most settings are medium/low. I didn't use the sim for a few months and just recently came back and never that that problem. While the VRAM is not full performance is totally fine and smooth. I'm using DX11 and use neither a pushback tool nor Yourcontrolls, that's known to cause issues. I set the usage to CPU in the fenix app and use a 4k livery and not the high resolution cockpit textures. 

Anyone got an idea what might cause this?

Try this video

 

 

4 minutes ago, kakihara123 said:

I got the following system: 

RTX 3080
Ryzen 7 5800x
32GB Ram
NVME ssd

I play@ 3440x1440 or with an Index with 100% resolution scale.   A few times now, I noticed that my FPS absolutely tanks randomly and when I look at the VRAM usage it is completely full. I only had it while using the Fenix A320, but that could be coincidence, since I didn't use other planes much since the issue occurred. Settings on flat were High/ultra, but I lowered all those ultra ones to high. On VR most settings are medium/low. I didn't use the sim for a few months and just recently came back and never that that problem. While the VRAM is not full performance is totally fine and smooth. I'm using DX11 and use neither a pushback tool nor Yourcontrolls, that's known to cause issues. I set the usage to CPU in the fenix app and use a 4k livery and not the high resolution cockpit textures. 

Anyone got an idea what might cause this?

Photogrammetry.

2 minutes ago, rutra said:

Try this video

 

 

This video talks about RAM, not VRAM. My RAM is pretty empty....

2 minutes ago, Fiorentoni said:

Photogrammetry.

But why did this not cause an issue before? And also This also happened @ FL350 over an area without photogrammetry at all. 

I have a similar equipment to yours and it helped me. Just try it

8 minutes ago, rutra said:

Try this video

 

 

These YouTube videos are nauseating, and snake oil mostly. 

I overserved it a bit. It doesn't really matter what plane I use. I flew (and landed) in the middle of Leipzig, which had Photogrammetry from the start. VRAM usage varies between about 4-5,5 gb, so enough room left. It seems that something is causing it to randomly spike up and uses all it gets. 

44 minutes ago, Ianrivaldosmith said:

These YouTube videos are nauseating, and snake oil mostly. 

Try it for yourself. This guy's videos has helped me get the best out of MSFS, they are far from snake oil.

11 minutes ago, shamrockflyer said:

Try it for yourself. This guy's videos has helped me get the best out of MSFS, they are far from snake oil.

I’ve been tweaking flight sim systems since 1997. I don’t have any issues other than I wish they’d optimise the sim more….. imo, I can do without over the top, click bait, sensationalist YouTube videos. Whatever you want to call them. 
If it works for you, good 🙂 

I just wish we had some normal videos, instead of the current context of YouTube videos. I suppose it’s all about the money though. Hits and the like. 

1 hour ago, kakihara123 said:

  A few times now, I noticed that my FPS absolutely tanks randomly and when I look at the VRAM usage it is completely full.

I'm not sure what MSFS does, but some apps -- when VRAM is full -- will move that data into system RAM.  And when that happens, it's not good for overall performance.

And even if MSFS doesn't do that, any time you max out VRAM you're looking at a situation where the incoming data has to wait for old data to exit, and that can definitely cause an FPS drop and/or stutters.

Just now, Mace said:

I'm not sure what MSFS does, but some apps -- when VRAM is full -- will move that data into system RAM.  And when that happens, it's not good for overall performance.

And even if MSFS doesn't do that, any time you max out VRAM you're looking at a situation where the incoming data has to wait for old data to exit, and that can definitely cause an FPS drop and/or stutters.

Ok, maybe I phrased it a bit wrong. I am not wondering at all that my FPS tanks when my VRAM is full. I want to know the cause for the VRAM to fill up suddenly in the first place. Normally it always hovers at around 5gb, so that is a pretty big jump for seemingly no reason. 

4 minutes ago, kakihara123 said:

Ok, maybe I phrased it a bit wrong. I am not wondering at all that my FPS tanks when my VRAM is full. I want to know the cause for the VRAM to fill up suddenly in the first place. Normally it always hovers at around 5gb, so that is a pretty big jump for seemingly no reason. 

In that case, it is hard to say, it could be VC textures, but it could be some scenery too.  If you are able to re-create this big jump in VRAM usage every time, that may help you pinpoint what's causing it.

Otherwise, I'd empty out my /Community folder and run a default aircraft and see if I get the VRAM jump then.

17 minutes ago, kakihara123 said:

Ok, maybe I phrased it a bit wrong. I am not wondering at all that my FPS tanks when my VRAM is full. I want to know the cause for the VRAM to fill up suddenly in the first place. Normally it always hovers at around 5gb, so that is a pretty big jump for seemingly no reason. 

Depends on where you're flying and what addons and graphics settings all combined.  Currently at my home airport with a modest freeware update in the Fenix I'm at 7 of 8GB of VRAM.  If I go somewhere like Macco's EGCC that jumps up to the mid 7's.  Similarly same two airports I'll typically be mid 6's in something like the FBW or PMDG 737 at my home, but at EGCC for example it's still mid 7's.  Once you go over that it starts swapping with system RAM which itself is not only slower than VRAM, but the card has to go over the PCIE bus to get to it which is even slower.  VRAM usage was why I had to give up using the freeware EGKK while trying to stream.  I had MSFS tuned just enough to use the addon, but the extra overhead from OBS trying to composite the scene before rendering would push VRAM over the edge and I'd go from like mid-40's to the teens.

 

edit:  So the key takeaway as to why the FPS tanks is that the card is having to sit there and wait for the system to send it whatever it needs from the system RAM.  FPS tanks because it literally can't render anything because it's waiting for resources.

Edited June 9, 20223 yr by flyinion

What Rendering option do you have in the Fenix Rendering settings ?  CPU or GPU ?