In several months of trying, I never was able to get my 2x 980Ti SLI config to work properly in P3D v4.0...one GPU would load up, the other would stay at 4-7% load.  P3D V3 worked as normal with the GPUs sharing the load.  Tried three different drivers, clean installs, deleted about a dozen sets of shaders.  Nothing worked.

So quite happily, installation of the 4.1 client and content updates now has my SLI config working normally in P3D v4.1--I was seriously contemplating driving to Denver tomorrow to buy a 1080Ti just so I could be done with it.

So, I'll call this one a win just for that.

Regards

Hi Bob,

Good to see you still pushing the envelope.

How did the cards perform frame and quality wise in SLI versus single?

Would really be interested in how much of, and what kind of an advantage SLI is at this stage.

Kind regards,

 

16 minutes ago, w6kd said:

In several months of trying, I never was able to get my 2x 980Ti SLI config to work properly in P3D v4.0...one GPU would load up, the other would stay at 4-7% load.  P3D V3 worked as normal with the GPUs sharing the load.  Tried three different drivers, clean installs, deleted about a dozen sets of shaders.  Nothing worked.

So quite happily, installation of the 4.1 client and content updates now has my SLI config working normally in P3D v4.1--I was seriously contemplating driving to Denver tomorrow to buy a 1080Ti just so I could be done with it.

So, I'll call this one a win just for that.

Regards

Must be something else on your system. SLI has been working great on my 4.0 system (and still) . Even better than V3

 

Thanks

Michael Moe

Hi Stephen;

  Test scenario was the PMDG NGX at LatinVFR KMIA, night, 1/2 mile in fog and rain with ASP4, with dynamic lighting on.  I run a 4K 55" TV for a monitor.  On one card I get ~20-24 fps and a fairly jerky experience.  With both in SLI, I can hold 30 locked to the TV refresh rate with VSync and very smooth in the same conditions.  Not sure how a 1080Ti would compare, but with SLI working, the two 980Tis are still packing what it takes to make P3Dv4 really sing.  In daytime without the weather it really is pretty sweet.

  That said, if I were looking right now I'd go with a 1080Ti to save the butt pain of SLI.  It's been a real adventure these last few years dealing with SLI madness.  I do sometimes wonder what a pair of 1080Tis in SLI would be like, but I can't say I'd be adventurous enough to try it.  I think SLI will go the way of the dodo fairly soon.

Cheers

 

41 minutes ago, w6kd said:

Hi Stephen;

  Test scenario was the PMDG NGX at LatinVFR KMIA, night, 1/2 mile in fog and rain with ASP4, with dynamic lighting on.  I run a 4K 55" TV for a monitor.  On one card I get ~20-24 fps and a fairly jerky experience.  With both in SLI, I can hold 30 locked to the TV refresh rate with VSync and very smooth in the same conditions.  Not sure how a 1080Ti would compare, but with SLI working, the two 980Tis are still packing what it takes to make P3Dv4 really sing.  In daytime without the weather it really is pretty sweet.

  That said, if I were looking right now I'd go with a 1080Ti to save the butt pain of SLI.  It's been a real adventure these last few years dealing with SLI madness.  I do sometimes wonder what a pair of 1080Tis in SLI would be like, but I can't say I'd be adventurous enough to try it.  I think SLI will go the way of the dodo fairly soon.

Cheers

 

Yep,SSAA, METARS with OVC and properly Dynamic lights and reflections is where i (think) SLI 1080TI´s would be useful

 

Thanks

Michael Moe

5 hours ago, w6kd said:

I do sometimes wonder what a pair of 1080Tis in SLI would be like, but I can't say I'd be adventurous enough to try it.  I think SLI will go the way of the dodo fairly soon.

I'm using 3 x 1080Tis in a 3-way SLI configuration. Originally I'd planned one projector to each card (rather that 3 PCs each with a card), but tried SLI with 4.0 and whilst it is no faster, it is certainly smoother, and smoothness is important.

4.1 performs about the same for me as 4.0.

Pete

 

Hi guys !

Could you let me know how much GPU usage you get with each your GC in SLI ?

Thanks 

Hi Pete, I’m the Dutch guy you met at Cosford Flighsim show at Prosim stand.. ( remember the selfie haha ) May I ask you why you have decided not to go for your original plan to use 1 card per projector  but rather use them in SLI? In theory I would say that 1 card per projector sounds really good as you will have 100 % dedicated usage of each card for each projector as if you would have 3 PC’s with such a card for each projector...

On 13/10/2017 at 6:37 AM, w6kd said:

In several months of trying, I never was able to get my 2x 980Ti SLI config to work properly in P3D v4.0...one GPU would load up, the other would stay at 4-7% load.  P3D V3 worked as normal with the GPUs sharing the load.  Tried three different drivers, clean installs, deleted about a dozen sets of shaders.  Nothing worked.

So quite happily, installation of the 4.1 client and content updates now has my SLI config working normally in P3D v4.1--I was seriously contemplating driving to Denver tomorrow to buy a 1080Ti just so I could be done with it.

So, I'll call this one a win just for that.

Regards

Hello

Do you have the sli set up in the ndivia control panel as "Single GPU" or the other option (I forget what it is)

I have "Maximize 3D Performance" ticked in the Configure SLI, Surround, PhysX menu in nVidia control panel.  It shows a green "SLI" bar bridging across the two video cards and a single connection to the monitor (TV) from the leftmost one only.

nVidia Inspector is set to default for P3D.

Regards

I gave up on SLI "performance mode" as it seemed too dependent on nVidia driver versions ... it also has some strange side affects generating incorrect z-order where I would see building/ground objects render in front of clouds or in some cases PAPI lights wouldn't render at all.  Not to mention I had to disable it for use with XP11 and other flight sims.

BUT, it's great to see some positive reports on SLI.  I would love to see someone post some timeframe data with and without SLI using SSAA and DL (same flight scenario) ... Vsyn On/Off.  Who knows, maybe I'll buy two V100 GPUs instead of one when available.

Cheers, Rob.

EDIT: Precision EVGA XOC will show you GPU loads across each GPU (when you enable OSD and setup each GPU's OSD setting). https://www.evga.com/precisionxoc/

I have since switched to a 1080TI but when I was running the 1070's in SLI I used EVGA XOC and the load was split between the two cards pretty evenly. I really had to work hard to get them much above 70% and that would be with heavy clouds, high density airport and coomplex a/c. Most of the time it was below 50% usage.

As others have said, I gained no FPS from SLI but smoothness was the thing that I noticed.

Vic

I use Nvidia Inspector to  show me the loads and memory use etc in realtime. 

IT can be placed above P3DV4 so it shows all the time flying. 

Evga XOC is not happy on my system 

Thanks Michael Moe 

1 hour ago, Rob Ainscough said:

I gave up on SLI "performance mode" as it seemed too dependent on nVidia driver versions ... 

BUT, it's great to see some positive reports on SLI....

Yes, I remember the havoc that ensued with P3Dv3.4 when a particular driver (or two) rendered SLI useless. It was a real showstopper for me since I was trying to make do with two GTX580's in SLI, which made the sim usable. It would hardly move with just one. Never tried it in P3Dv4.0 (or v41) as I bought a GTX1080 with the trimmings.

 

32 minutes ago, vgbaron said:

I have since switched to a 1080TI but when I was running the 1070's in SLI I used EVGA XOC and the load was split between the two cards pretty evenly. I really had to work hard to get them much above 70% and that would be with heavy clouds, high density airport and coomplex a/c. Most of the time it was below 50% usage.

As others have said, I gained no FPS from SLI but smoothness was the thing that I noticed.

Vic

Vic, 

Did you get an FPS difference between the single 1080Ti and the 1070's in SLI? 

That seems to me to drill down on the entire SLI/no SLI matter.

Kind regards,

Not that I noticed Stephen. Of course, I lock at 20 so I wouldn't see any increase and smooth is smooth at any FPS. What I do notice is that the Ti doesn't seem to work as hard as the SLI 1070's. Same situation wher the SLI would giver me 50% usage on both, the Ti is around 35 or 45%. That card is a beast.

Vic