touchdown84

P3Dv4 VRAM limit?

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Hi,
is there a maximum amount of VRAM the sim will use?
I'm asking because I can't get it to use more than 7-8GB (my GPU has 12GB VRAM) and I had some situations where I thought "why doesn't it have this in vram?" like when I flew over EGLL and when I looked back over my shoulder all airport buildings were textureless/black and it took a second to re-load the textures which were already there 10 seconds ago.

With TEXTURE_SIZE_EXP=10, LOD_RADIUS=14.500000, all Settings @max and ORBX-England I get to 7.3-7.8GB VRAM. I thought it might be because I only use 1080p, but even with DSR@4k the VRAM consumption did not change.

So could there be a limit, e.g. 8GB? (I never saw over 8GB VRAM usage...)

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I was wondering the same thing, but in my case it looks like my regular ram is capped at 8gb. 

John

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where do you put texture size exp 10 at in the config file?

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5 minutes ago, Patriot3810 said:

where do you put texture size exp 10 at in the config file?

Prepar3D.cfg:

[TERRAIN]
TEXTURE_SIZE_EXP=10

 

 

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Yeah 8 seems to be max to for me 2, tried texture_size 11 and 12 but just kills scenery.

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2 minutes ago, Zaros said:

Yeah 8 seems to be max to for me 2, tried texture_size 11 and 12 but just kills scenery.

Same for me, value above 10 loads no ground textures at all...

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What is the default texture size= XX ?

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8 minutes ago, Nyxx said:

What is the default texture size= XX ?

default texture size exp parameter is 8

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Perhaps another line in the config file somewhere which limits maximum VRAM usage because Rob Ainscough definitely stated he observed VRAM usage at nearly 11GB utilizing a value of 10 for the TEXTURE_SIZE_EXP setting.  

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Running TEXTURE_SIZE_EXP=10 and i've never gone above 7.4GB VRAM used. I've got 12GB to play with. No matter what setting i throw at it, it's not using more.

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49 minutes ago, Syonco said:

Running TEXTURE_SIZE_EXP=10 and i've never gone above 7.4GB VRAM used. I've got 12GB to play with. No matter what setting i throw at it, it's not using more.

And what exactly is bad about this? The less VRAM an application needs the better the performance. ;)

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1 minute ago, Farlis said:

And what exactly is bad about this? The less VRAM an application needs the better the performance. ;)

Nothing necessarily bad about it, just curious as it was said specifically when using the "TEXTURE_SIZE_EXP=10" you'd see 10GB+ of VRAM usage :)

 

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Here's  the section in Jordan King's video  that explains the Texture exponent:

 

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Good morning. I added your tweaks, EXP = 10 and LOD 14.5 and I am sitting here at the gate in KSFO in the PMDG 747, flight to EDDM loaded with:

 

VRAM: 9,24 GB used

RAM: Private Bytes: 15 GB, Working Set: 6,7 GB

 

Everythng smooth as butter. Man I love V4....

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Do you all also experience a massive increase in loading times when using TEXTURE_SIZE_EXP=10?

I measured

TEXTURE_SIZE_EXP=8  ->       50 sec
TEXTURE_SIZE_EXP=9  -> 1 min  5 sec
TEXTURE_SIZE_EXP=10 -> 2 min 32 sec

and CPU is almost @100% during loading, don't know if it is just copying terrain to vram or what calculations it performs.

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touchdown84, what is your P3D on? SSD, PCIe m.2?

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36 minutes ago, SimonC said:

touchdown84, what is your P3D on? SSD, PCIe m.2?

P3D on SSD (SATA3), Windows is on smaller M.2

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What's the default LOD? I mean it seems pretty good with the slider at max, so i'm wondering why to push it some more? 14.5 sounds very very high?

I also get a max 7GB(ish) VRAM usage when using the TEXTURE_EXP=10 option btw..

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20 minutes ago, touchdown84 said:

P3D on SSD (SATA3), Windows is on smaller M.2

OK, I am experiencing similar load-times. I wonder if it would go faster from an 960pro or the like.

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6 minutes ago, stripealipe said:

What's the default LOD? I mean it seems pretty good with the slider at max, so i'm wondering why to push it some more? 14.5 sounds very very high?

I also get a max 7GB(ish) VRAM usage when using the TEXTURE_EXP=10 option btw..

What GPU?

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3 minutes ago, stripealipe said:

What's the default LOD? I mean it seems pretty good with the slider at max, so i'm wondering why to push it some more? 14.5 sounds very very high?

I also get a max 7GB(ish) VRAM usage when using the TEXTURE_EXP=10 option btw..

I just tried setting my LOD to 14.5 - and i'm not noticing a difference from the default 6.5. Nor did it affect my VRAM usage.

Does anyone else notice a significant difference when changing the LOD past the default setting? 

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Nope.

TEXTURE_SIZE_EXP is the only thing that makes a difference, yet it will only be effective if you have more VRAM - which makes sense, it will kinda "expand" if there is space.

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18 minutes ago, Syonco said:

I just tried setting my LOD to 14.5 - and i'm not noticing a difference from the default 6.5. Nor did it affect my VRAM usage.

Does anyone else notice a significant difference when changing the LOD past the default setting? 

I also cannot see a (visual) difference between LOD 6.5 (max. Slider) and 14.5, even when comparing screenshots.

But increasing AUTOGEN_DRAW_DISTANCE to e.g. 50000 (max. slider is 30000) has a big effect on the visable houses/trees/lights radius, though it has a big performance impact, even with autogen only on dense.

18 minutes ago, SimonC said:

What GPU?

Titan X (Pascal)

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