1.29.25.0 DX12 TAA - GPU VRAM usage increases with Terrain LoD increase

User Support Hub Install, Performance & Graphics
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1

As Terrain LoD increases, VRAM increases.

Intel ARC GPU A770, 16GB
i9-9900K, Z390 MB, 64GB
4K, DX12, TAA, Render Scaling=100, VSYNC=on
Xbox Performance Statistics

T=Terrain, O=Object (set in UserCfg.opt) 1=100, 9=900

  LoDs  CPU RAM GPU VRAM           FPS
------- --- --- --- -------------  --- 
T=1 O=9  5% 24% 81%  55% ( 8.8 GB)  30
T=2 O=9  5% 25% 85%  62% ( 9.9 GB)  30   
T=3 O=9  5% 27% 72%  67% (10.7 GB)  27
T=4 O=9  6% 28% 73%  75% (12.0 GB)  25
T=5 O=9  7% 29% 66%  78% (12.5 GB)  22
T=6 O=9  5% 30% 63%  85% (14.0 GB)  21 VRAM=97% while flying
T=7 O=9  7% 34% 65%  97% (15.5 GB)  20 VRAM=99% while flying

For each entry, UserCfg.opt edited with T LoD value 
and then set to Read Only. 
FS2020 started, loaded the same saved Flight Plan and read 
the statistics while sitting on the runway ready for takeoff.
2

Vram usage goes up because that’s where scenery gets loaded. Higher LOD = more scenery.

3

Yea. I never could see this since my GTX 1660 TI only had 6 GB.

1 Like
4

Nice upgrade, once all has settled let us know what you think.

If you join the beta there’s a little more leeway for mainthread limited so I now suggest calibrating 500-1000ft above difficult scenery and try to match mainthread and gpu render times. On the ground you will lose a few fps but it should stay smooth.

5

This is really nothing new since SU5. You can actually max out the VRAM on a 3090 by setting the LOD at 6 in certain dense areas.

I actually posted about this a while back:

6

I’ve noticed that the Windows Display Manager VRAM size is about 1/3 the size of MSFS VRAM which is significant. I don’t know why it would be using so much. There should be some way to configure it or limit it.