Driver mis-match ... Texture_Bandwith_Mult ...

[Guest]

Some folks may already know this, but add or change this setting in your Prepar3D.cfg

 

[Display]

TEXTURE_BANDWIDTH_MULT=160

 

This works very well for my Titan Black, went from 30 fps to 42 fps with no stutters.  Default value is 30.

 

I must admit, it was the FSX:SE thread and I think Vic that mentioned this ... so give them (or others) full props.

 

Cheers, Rob.

[WfordJr 1]

Will the increase in FPS equate to smoothness? Its not always the case as I already have high FPS with P3D but it stuttery.

[GSalden 4,655]

Will try it tomorrow and see how my 2 Titans in SLI behave.

 

Rob , a little of topic question : since I have set my Titans in SLI my system sometimes need 3 times to boot up.

Each time before switching to the desktop the pc restarts itself 1 or 2 times extra.

Dropbrox shows 2 extra windows instead of just one.

 

When turning off SLI all issues are gone.

 

However when running the system is completely stable and P3D is performing great....

[N1G 88]

Some folks may already know this, but add or change this setting in your Prepar3D.cfg

 

[Display]

TEXTURE_BANDWIDTH_MULT=160

 

This works very well for my Titan Black, went from 30 fps to 42 fps with no stutters.  Default value is 30.

 

I must admit, it was the FSX:SE thread and I think Vic that mentioned this ... so give them (or others) full props.

 

Cheers, Rob.

 

Rob, I did a search here just yesterday on the TBM settings and almost all replies posted stated that it does nothing. My 1st thought was why did the devs leave it in. 

I will give it a shot.

 

Bob

[FlyIce 354]

I normally discard such claim of "40% FPS increase in P3D" instantly, but I'm amazed that this comes from Rob. Sure I'll give it a try tonight. It'll be unbelievable if this TBM=160 indeed works to jump my fps from 30 to 42!

[ryanbatc 12,774]

I had no significant change between the default of 30 and the 160 entry.  I even monitored GPU usage... and that was literally the same.  Using a "dated" GTX 570 here.

 

I didn't do any thorough testing... just default mooney on the ramp at a default airport, identical weather, no AI.

[Cai Zicheng 171]

What is the trade off?

[N1G 88]

Just tried it with my 4gig 760 and no change. I had a little hope but now I need to go have a piece of Christmas fudge.

 

Bob 

[steve howlett 137]

Tried it Rob

exactly the same FPS for me.

suppose like all other tweaks it will vary from machine to machine.

 

    steve

[Paul K 1,282]

Just tried it, and I think there might be some benefit to be had. I don't think its another case of me seeing what I want to see - there does appear to be a genuine rise in FPS.

[MikeAdamo 51]

Thanks for posting this up Rob. I had lost hope with getting P3D 2.4 running on my rig but over the past 3 days I completely re-installed and stepped through each tweak one at a time and I'm happy to say that this tweak has pushed my FPS up to the mid to high 60's from the mid 40's to mid 50's. This is of course, without any weather so if I can maintain a steady mid to high 30's I'll be very excited.

 

Thanks again and props to Vic and the folks tweaking/playing around with FSX-SE!!

 

Mike

[MarkW 1,490]

Very interesting idea.  I actually tried this in FSX to see if anything would happen and I think I got a good bump and no small pauses either.   I guess I will have to fly with it for a while to see if it is real.

 

Default Scenario

TMB = 80

FSDT Vancouver, ORBX Global, Vector, ASN, PMDG737

Frames in the VC - 22 - 25

 

Test

TMB = 160

FSDT Vancouver, ORBX Global, Vector, ASN, PMDG737

Frames in the VC - 22 - 30 (mostly 28 to 30 but it did dip down a few times when looking around the vc).

[Michael Moe 493]

Very interesting idea.  I actually tried this in FSX to see if anything would happen and I think I got a good bump and no small pauses either.   I guess I will have to fly with it for a while to see if it is real.

 

Default Scenario

TMB = 80

FSDT Vancouver, ORBX Global, Vector, ASN, PMDG737

Frames in the VC - 22 - 25

 

Test

TMB = 160

FSDT Vancouver, ORBX Global, Vector, ASN, PMDG737

Frames in the VC - 22 - 30 (mostly 28 to 30 but it did dip down a few times when looking around the vc).

 

No effect in FSX on my system ,same as above but with PNW at gate 54 i am at 30-33fps (Locked 40)

 

Michael Moe

 

(remember to switch off shadows with the NGX in FSX ,it gives you a 5-10% boost as well) (DX10 cant handle NGX VC shadows anyway)

 

Will try P3D

 

Update: No effect on my system in P3D

 

i7-4770K@4,7GHZ

GTX780SC 3GB

[bakayoyo 6]

Interesting, is this the mysterious FSX steam edition boost trick emulated on P3D?

 

Going to have to give that a go tomorrow.

[Slayer 190]

I asked about this after the release of 2.0 about the value of 30 and why so low of a default setting. Didn't get a definite answer except that the setting may be depreciated for P3Dv2 and left in there for compatibility. Back then I tried 120 and saw zero impact on my system so reverted it back to the default of 30.

 

At any rate the way I see it if your GPU is already maxed out you would probably see no benefit from this setting. If your GPU is being artificially held back due to this setting then you may get a benefit from it. As with any other tweak it will affect each persons individual system differently based on their hardware thats why we are seeing different results. 

 

Edit : My initial thought was that they kept it at a low number because of adding tesselation to the GPU so as to leave a bit of headroom for that to work...