2 hours ago, AnkH said:

I have a freesync monitor, FPS internally set to 30. Do you really think that this is just because the 6900xt is so much faster and the CPU limit is now that obvious that it results in stuttering? I honestly doubt, FPS are only about 20-30% higher, if at all

Do NOT limit the frames in game..  use the settings in the Radeon Software under Radeon Chill,  however since the release of 21.11.3 drivers from AMD, I haven't noticed the GPU going mental as it did before.

You are probably CPU limited now, so adjust down your LOD's and details some.

Graham

2 hours ago, MrFuzzy said:

Welcome to the Limited by Main Thread club 🙂 Did you set precaching to Ultra?

You could try limiting the framerate to a fixed low value and/or using a freesync monitor and/or decreasing terrain LOD.

His other option is to increase the in game render scaling until there is more of a balance and the gpu goes back to being the limiting factor (at least in most scenarios)

I run the game with a 8700K at 5.0GHz and 32GB RAM. Still voes not make a lot of sense to me that I get basically the same FPS on ground of e.g. VHHH ac with the 1080ti but instead of absolutely smooth, it is now a stutterfest. Will try the suggestions though, thanks guys

7 hours ago, AnkH said:

I run the game with a 8700K at 5.0GHz and 32GB RAM. Still voes not make a lot of sense to me that I get basically the same FPS on ground of e.g. VHHH ac with the 1080ti but instead of absolutely smooth, it is now a stutterfest. Will try the suggestions though, thanks guys

Mmm... no, that doesn't make sense.

I understood that with the 1080 Ti you had constant low framerate (GPU limited) and with the 6900XT large oscillations that make your experience less smooth.

What fps values are we talking about?

It is about 30-40 FPS on ground or when flying around using the drone. When doing turns, it is stuttering like hell, when flying straight, stutter is less pronounced. Might be the scenery, will also try somewhere else

1 hour ago, AnkH said:

It is about 30-40 FPS on ground or when flying around using the drone. When doing turns, it is stuttering like hell, when flying straight, stutter is less pronounced. Might be the scenery, will also try somewhere else

Something doesn't sound right here. I know we only share the same card type and the rest of our systems are very different but when flying I'm getting butter smooth 80-105 FPS with Ultra settings. The only stutter I get is a documentated hitch when I am on the ground and look in a specific direction reletive to the sun which I really hope they fix soon. You don't happen to be running in DX12 mode do you?

Nope, DX11 here. Might be the scenery, will try different locations. The numbers do not sound right, I agree. I also realized that within adrenalin, some settings are default that make no sense for a sim, like "anti lag" and stuff.

Ok, good news, getting there it seems: switching ingame from ultra preset to low preset and clicking on "apply & save" already cured most of those strange stutters, now it is about fine tuning. Turning render scale so much up until I am 100% in a GPU limited situation (130) results in the smoothest experience, as some said, but then I am down to 50 FPS. Will keep it like that for a while now.

So, reminder for me (and maybe others): after such a GPU switch, the "low" - "ultra" switch seems to be a good thing to do.

Edited December 12, 20214 yr by AnkH

BTW: I now get 60-70 FPS when just sitting on the tarmac over at VHHH with the WF Scenery addon. Pretty nice, but the sim sadly still feels less smooth than with the 30-40 FPS I got with the 1080 Ti. And yes, it is related to the CPU limitation, as the stuttering is clearly represented with red lines indication "limited by main thread" in the graph when using the dev mode. What I still do not get is why this only happens when panning around and the lags are sometimes so huge, that FPS drop down to 20 or even below, while I had no, absolutely not a single comparable stutter with the 1080Ti when panning around. This phenomenon remains visible even if I limit FPS via AMD Adrenalin down to 30. So it seems that something is still strange here...

48 minutes ago, AnkH said:

Pretty nice, but the sim sadly still feels less smooth than with the 30-40 FPS I got with the 1080 Ti.

As you are CPU and bus-bandwidth limited, here are a couple of things to try:

- If you're able to run with freesync enabled, try disabling any external fps limiters and enable in-sim vsync / frame limit to 60 (or even 30). This can help with mainthread scheduling, without the traditional negatives of vsync.

- Delete and recreate your rolling cache (if you have this enabled). Having rolling cache on (on a fast SSD or NVMe) can sometimes help with stutters and pop-in when panning, particularly with photogrammetry.

- Keep settings to ultra (including terrain pre-caching), but notch back texture supersampling and shadow maps.

- Check that DPI scaling is performed by the sim: https://flightsimulator.zendesk.com/hc/en-us/articles/360016142680-All-versions-How-to-improve-the-performance

Also, what resolution are you running in windows and the sim? Installed on an SSD / NVMe?

 

Your Graphics cards is outperforming your CPU and you still need to dial back the CPU intensive graphics settings to minimise the stuttering, I suggest dialling back each setting 50% one by one and make a note of any that reduce the CPU loading then reset and move on to the next, then from that list, make a selective balance of adjustments to minimise the CPU spiking, you will not end up with MAX graphical fidelity which you can currently enjoy at high frame rate in limited scenarios, but a more consistent/smoother fps experience with slightly downgraded visual effects.

Using the dev mode, look for adjustments that bring the CPU and GPU timings to similar values.

Don't be frustrated by having a hugely powerful Graphics card and not being able to max it out because the CPU cannot keep up, as some of the graphics settings really hammer the CPU cycles no matter how powerful your GPU which affects frame rate stability. If the CPU is hugely overloaded by your settings during panning you will encounter the heavy frame rate swings and stuttering you are experiencing.

Also recommend try setting in game V-Sync on to 60 and using something like RTSS to set frame rate at around 10% lower than your average in game frame rate and work up from there until you find a selection you are happy with, ensure all you AMD graphics driver enhancement settings are off including the frame rate limiter.

What Screen res are you running and what in game resolution?

What are the temps on your CPU like when it stutters?

Thanks for the additional tipps, will certainly try those. But I have the slight feeling that you miss the point? I get CPU reasoned FPS drops way down of what I ever had with the 1080ti, THIS is what I dont get. IF the CPU is the culprit here, why I do not get the same FPS drops with the 1080ti? Why can the sim maintain a steady 30-40 FPS with no drops at all with the 1080ti, but with the 6900XT, FPS drop down to 20? If the drops would be above the FPS I get with the 1080ti, I would agree regarding in sim settings, but this is not the case... 

I am running at 1440p, my 8700K runs at 5GHz, max temps are around 70°C after several hours, the FPS drops happen right from the beginning when temps are even lower. 

That is why I think some settings are still wrong regarding my 6900XT, not regarding my CPU...

17 minutes ago, AnkH said:

IF the CPU is the culprit here, why I do not get the same FPS drops with the 1080ti? Why can the sim maintain a steady 30-40 FPS with no drops at all with the 1080ti, but with the 6900XT, FPS drop down to 20?

I guess an analogy would be drinking through a straw - with your previous GPU being matched to your CPU, you were getting a fairly constant flow. Now your GPU is taking big gulps so you're getting bubbles... 🙂

BTW, one additional setting to check is to disable HAGS in Windows (if you had it enabled).

Concur with the analogy, however no HAGS with AMD.

The 1080ti was pegging the CPU, the new card has removed that and now the CPU cannot keep up.

I run 4k but get very little increase in performance at 1440p for the same reason.

Edited December 15, 20214 yr by Simple B

I still dont get why the same CPU is perfectly capable to sustain 30-40 FPS in 100% of the scenarios with the 1080ti and now, with the 6900XT, it should be suddenly responsible for drops down to 20 FPS. I have never seen 20 FPS with the 1080ti, this tells me that the CPU can always maintain more FPS. But then why not with the 6900XT? Makes no sense to me, sorry...

Ok guys, whatever I tried so far is helping nothing. This sim behaves utterly strange since I switched GPU. Might consider a full reinstall, seriously...