I think the 10 GB VRAM of my 3080 are becoming short for MSFS.
In airports with addons, with A320 Fenix or FBW, I notice that in low movement scenes the FPS are stable but as soon as I look around the cockpit or in spot view looking around, the FPS immediately drop as low as 10 fps as VRAM shoots to its maximum.
It takes a few seconds of slow moving scenes again for the system to catch its breath and put the fps back up.
My first assumption is that this could be related to the modest VRAM of the original 3080.
Has anyone been in a similar position, having upgraded from a 8 or 10 GB card to something like the 3090 with 24 GB Vram ?
In which situations would you say the extra VRAM improved the performance ?
I regularly as stated by poster above on some recently released scenery dense airports & also using AI traffic see my VRAM usage on my 3090 at 60-70%. Not usually higher than that, but thatās 14 - 17 GB usage running at 4K. So with less VRAM I guess data may have to be switched in and out more which may bottleneck things a bit.
Then thereās the whole dx11/dx12 vram usage to think about. Dx12 used to work great in SU10, but SU11 took that improvent away, and as far as I can tell from others itās not any better again in SU12beta.
Unfair if you ask me as the only time DX12 was significantly better was the first SU10 beta but unfortunately that was causing mega problems for many users and had to be wound back. Otherwise it seems better now than itās ever been, at least thatās my experience - rtx3060(12GB), SU12 beta.
In this kind of situation, if you move your view fast from side to side around the cockpit for example, do you also experience a sudden drop of FPS to single digit or low 10ās , or can the VRAM keep up ?
I generally tune my system to be as close to out of main thread limited situation as possible, so I dial quite a bit back at dense airports - things like TLOD and many AI traffic sliders in game.
I also lock at 1/2 RR @ 30PFS to get āfluidityā rather than FPS. Generally speaking panning around the cockpit of airliners is smoother and more fluid for me locked at 30FPS than it is if left at higher FPS. I realise itās subjective to an extent. The main problem I see is one that has been around forever and that is slight stutters while taxiing around an airport and turning. Iāll never understand why.
Generally I donāt see huge dips in FPS though, and those can be related to CPU mainthread limited situations.
DX12 in SU10 for me with DLSS enabled was an extremely smooth all round experience eliminating those stuters while taxiing. VRAM that hadnāt been used before was being used and my system just felt smooth with that combination.
Then SU11 came along and my performance took a hit. DX12 wasnāt giving me the same fluid experience and I had to revert back to DX11/TAA for a while. Iām now using the DX11 & DLSS combination.
Iāve never been part of the beta program so I have no idea how it was during any beta phase. It was fine for me on SU10 final release, but we had SU10 released for just a few weeks before SU11 hit. SU12 beta I am not on so canāt comment. Iāve only just read other peoples refs to DX12 having not being improved yet.
Understood and yes smoothness can be subjective too. However anyone that reads my posts will know Iām absolutely nuts about retuning my system after literally any system patch or update, even the small ones and never, ever with a frame cap in place. I do this because parameters change without so much as a word as to what or why e.g. volumetric clouds ultra is a balance between gpu and cpu and the relationship between them can change seemingly at randomā¦ Take my word for it that once tuned out the differences in performance are never as great as some people seem to think, a couple of frames here or there which are often combined with e.g. slightly better or worse cloud composition.
P.S. Performancewise SU12 beta is looking very promising already and any remaining kinks just seem to be based on interaction with addons and apps.
I guess thatās it then, I need to upgrade the GPU.
The 3080 is still very decent for Flight Simulator at 4K, and itās only this VRAM thing that is starting to bug me in high density scenarios, which Iāve been using more lately.
The GPU market is in a sort of a limbo right now for FS.
I could sell my 3080 and put another 200 or 300 Eur for an used 3090, to get better fps and get 24 GB VRAM.
The 4070 ti with 12 GB would be within budget too and it seems to have slightly better performance than the 3090 in terms of fps, but doesnāt solve me the issue of the low VRAM.
On the other hand, the 4080 and especially the 4090 are still way too expensive for what I would like to spend right now to upgrade.
Then thereās also AMD, but for FS, I rather stay with Nvidia.
Personally I think the issue is in memory management/garbage disposal rather than outright size limitations and further tuning by Microsoft and Nvidia will get this stable eventually. They have already for my rtx3060 which despite itās 12GB vram never gets above 10 before knocking itself back to 6 or 7GB even in 4k. The release of the 4xxx series may have held up progress which sooner or later will ease sparing them more resources for unfinished ālegacyā projects and products.
Sure, would be great if Microsoft and Nvidia found a way to optimize VRAM usage, but on the other hand, (except for the wallet) more memory never hurts.
I have long had a suspicion that memory use and performance could be vastly improved by having a system of pre-render masks, so that only visible areas use any resources, leaving the rest just wireframe.
It canāt be quite as simple as that, though, or theyād have already done it.
How does that work when comparitively nothing is sandboxed? instead of 2 petabytes Bings database would be many multiples bigger and then thereās the the internet to consider.
Ah then I misunderstood. Tbh Iām not sure how it is done now or if such masking would benefit sim scenery. Iām sure Asobo would have looked at it or maybe itās already in operation (at least for non āobjectā scenery).
But thatās what Iām asking? If it works better that way I would imagine they probably do it for the streamed content. 3rd party hand built stuff might not be so easy
