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P3D v2.5 SLI test results, up 33%

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I used EVGA Precision X16 to monitor GPU's and usage to make sure both were being loaded (at normal clocks loads were between 70-90% on both GPUs).

 

The test setup:

 

Orbx FTX Global

Orbx KSEZ

PILOT's FTX Mesh

Default F-22

REX Soft Clouds

Weather = Cold Fronts theme

 

SLI enabled:

 

1b45df05f9cea9c7225f70c1287d06b0.png

 

SLI NOT enabled:

 

77579b337cc5a308c4e0ff2c72272683.png

 

Graphics settings used:

 

47c7eb4ea24a674cea3f06e829a31579.jpg

 

6ab3590261f20331de384040bb520a7b.jpg

 

23e109d48af34c87afa4640fc7ac3c7b.jpg

 

7bf6a3d05c8fed634e1408e67044f85a.jpg

 

29d482bb084534bbc3414cd97ac0687f.jpg

 

flight and weather file are here: https://drive.google.com/file/d/0Bw0Q-fAfEZwyNmpQMGFwcUJJS3M/view?usp=sharing

 

Hardware/Software used:

i7 5960X @ 4.375 Gz

16GB DDR4 @ 3000Mhz

2X Samsung 850 1TBs SSD

2X Titan X 12GB

Win7 64bit

 

Cheers, Rob.

 

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hmmmmmmm...that almost makes it worth buying another GTX 770… Thanks Rob I'll be looking forward to corroboration from here… And decide.

 

regards,

 

Chas

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Rob, I'm seeing a similar improvement with similar settings with my 2 980gtx setup. Pretty even gpu load 50/50% according to msi afterburner. Very happy. Only two issues, one is the lightning effect is corrupted (although I've read elsewhere that you don't experience that?). The other is after coming back out of in game menus sli mode is dropped - two quick 'alt-enters' solves that. In fact folk experiencing poor sli performance may want to give that a try as when it happens performance is worse (halved?) compared to non-sli operation.

 

Just to note that this was a totally fresh install of W8.1 + drivers + p3d and no cfg file tweaks or NI/NCP tweaks.

 

4790k @ 4.8

2 x 980gtx

Win8.1x64

4K @ 30hz

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Rob,

 

the average has increased with the SLI, but it seems more homogeneous without SLI.

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Be interesting to know what's happening at those single digit data points, in both cases.

 

gb.

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Solution for the rich guys only..... I struggled to buy my 650 Ti 1GB card... just imagine what it would be to buy two 780.... Really not for me :-(

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Rob, you had written:

 

"LM have been working with nVidia to make SLI work ... it's a back and forth dialog. Beau has made adjustments to code in order to meet nVidia's needs to make SLi a reality at the driver level. This dialog has been going on for a long time, but we should finally see the results soon."

Cheers, Rob.

 

Where is the fix of LM for adjustement of code?

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I used EVGA Precision X16 to monitor GPU's and usage to make sure both were being loaded (at normal clocks loads were between 70-90% on both GPUs).

Thanks for sharing Rob!

 

Have you tried enabling SGSS yet to see how that's handled in SLI?

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Thanks Rob for the test and for sharing your vid on youtube. Gonna try SLI with my 980s tomorrow.

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Rob,

 

I am actually more interested in how your sim doesn't melt down with all those settings blasting away on your VAS.   XD   Is that just your test settings or that how you fly?   Surely those heavy settings is giving to troubles in major aircraft like PMDG?

 

On the topic here;  guess I'll get that second GTX 980 ordered.

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@Rob:

 

Can I ask (or can you link me to a place) what you were able to "change" with SLI from your normal Titan X config?

 

i.e.  what were you able to ratchet up?

 

Perhaps you have a link to your normal Titan X settings and I'll poke around on my own?

 

Cheers

 

P.S.  I'm also having the very odd lighting flashes some are seeing at times

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I might be missing something here. Has there been an update released for SLI or are we still awaiting it in the next few weeks?

 

Just seems like a lot of sli chatter in the past 24hours but I can't find any update on the p3d official forum

 

Tom

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I might be missing something here. Has there been an update released for SLI or are we still awaiting it in the next few weeks?

 

Just seems like a lot of sli chatter in the past 24hours but I can't find any update on the p3d official forum

 

Tom

 

The new drivers seem to officially support SLI - But the jury is out yet on whether a future P3D update will further optimize for SLI (one would imagine there is plenty of room to improve on P3D side)

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The new drivers seem to officially support SLI - But the jury is out yet on whether a future P3D update will further optimize for SLI (one would imagine there is plenty of room to improve on P3D side)

P3D itself is a work in progress - I would EXPECT that further refining of the SLI settings will occur.

 

Vic

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P3d 2.5 is the version that Rob used to test SLI. The only thing new is the P3d profile in the the most recent nVidia display driver 352.86.

 

Given that P3D is still fairly CPU intensive, the improvement in frame rates is substantial. Is it worth the extra money though? 33% scaling is a bit low for doubling the cost of your GPUs. 60 to 70% scaling is typical for most recent 3D apps:

http://www.ocaholic.ch/modules/smartsection/item.php?page=20&itemid=1523

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Where is the fix of LM for adjustement of code?

Ummm - built in to the code? Or do you expect a patch?

 

Beau has been making the changes as we go and have been incorporated in the various releases.

 

Vic

For those experiencing strange light artifacts or flickering strobes on a/c - try this -

 

in Nvidia Inspector AA settings - change the AA Setting to 8xCSAA and see if that helps. I don't know why but any of the CSAA settings stop the flashes on my system.

 

 

Vic

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Lovely! And appreciated! But…

 

Even with your screaming system and two Titans in SLI you were still down to 24 frames a second and that for my pocketbook, tells a huge story....SLI plus windows 10 and DX12?

 

I'm getting ready to go on a fixed income and I sure as hell won't be able to constantly upgrade.

 

Chas

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Vic,

With your SLI profile in NVI I already had 20-40% more fps than with a single card with older drivers...

Therefore I am still wondering if this is better...

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So I did a fresh install of the drivers (using clean install to wipe any settings) and things seem much better for me.

 

Rob:  Are you using any tweaks to the NVIDIA settings (not inspector, just the normal NVIDIA settings menu)?

 

Anything like the vsync or triple buffering or single display performance type selections?

 

Maybe you'd be so kind as to post a screen of that?

I'm not sure what to select or not select in there.

 

I notice you choose Triple Buffering in P3D settings, but the default NVIDIA settings for P3D have that feature "off" --- confused

Cheers

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Vic,

With your SLI profile in NVI I already had 20-40% more fps than with a single card with older drivers...

Therefore I am still wondering if this is better...

Gerard - since I don't look at FPS I cannot say but what I have noticed is this -

 

Old driver with my SLI settings would use around 75% on both in heavy situations.

 

New driver with same settings uses around 50% in similar situations.

 

And it appears smoother.

 

On MY system, the light flashes are due to using AFR - don't know why but the CSAA setting fixed them.

 

Vic

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Thanks Vic.

As I sold both GTX Titans and bought one Titan X I am unable to test this.

 

Btw : if SLI means higher FPS , than probably most people like to use more detailed settings ( eg : autogen ) because now they can .Which means : even faster OOMs...

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with my CPU @5GHz and GTX980 I'm happy with my fps, it would be good to know if SGSS is possible without any impact in overcast with SLI, if so, I will buy another GTX980

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Sorry for delay response, I had surgery on my larynx to remove something that wasn't supposed to be there. I'm up and alert now, but groggy. Hence why I've never done voice overlays in my video ... Because I could barely speak. I should have my voice back in a couple of weeks, full recovery 8 weeks.

 

I haven't noticed any artifacts, but I will test those scenarios described above and see if I can duplicate.

 

Yes this IS real SLI support. I've posted this before showing how to tell it is the real deal.

 

48 FPS is actually pretty good and on par with 3d shooters (that many like to compare) that operate at 4K resolution with this many graphic features enabled (tessellation, shadows, HDR, high textures, 8xMSAA, 16xAF, reflections, volumetric, etc) - fire up 3DMark Fire 4k tests if you want to see SLI Titan Xs rendering a scene at 12 FPS with same type of graphical features enabled.

 

Please not another OOM thread. I posted these results simply to show SLI is real in these drivers without having to anything other than enable SLi from NVCP ... and there is a 33% improvement for me. It's not a thread about value and OOMs.

 

Cheers, Rob

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Happy to hear things went well at the doctor's but guess there won't be any online flying taking to ATC for a couple of weeks for you then :wink:

 

As you might remember I was thinking to get a 980Ti but now with the SLI support in P3D I'm thinking a very cost-effective solution might be to buy another used Titan. I would like to think having 2 Titan cards working together in SLI would provide P3D well enough with the GPU power needed or what do you think?

 

Another thing I would like to ask, do you think 2 Titan cards in SLI would allow to start using SGSS again to get rid of the bad AA? For us not running @ 4K :wink:

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