I've read before in this forum that Prepar 3D V2 doesn't support SLI until Nvidia write SLI profile.  Do I missing something, or Nvidia has fixed that by now?

The newest driver 352.86 and 353.06 and 353.12 has a profile for SLI and most simmers seems to have good results with it.

 

I do not . I have an issue when i click the right mousebutton the SLI goes out of SYNC (FPS gets at least halfed and lots of stutter)and is not able to always get it in SYNC afterwards (ALT-ENTER) . My FPS is also lower than on a single-card .

 

Undocking PFD,ND has the same symptoms (maybe because of right mouse clicking)

 

I have tried different monitors,mouse and even drivers with no luck.

 

Going single card and everything is fine here

 

But again most have success

 

Michael Moe

The newest driver 352.86 and 353.06 and 353.12 has a profile for SLI and most simmers seems to have good results with it.

 

I do not . I have an issue when i click the right mousebutton the SLI goes out of SYNC (FPS gets at least halfed and lots of stutter)and is not able to always get it in SYNC afterwards (ALT-ENTER) . My FPS is also lower than on a single-card .

 

Undocking PFD,ND has the same symptoms (maybe because of right mouse clicking)

 

I have tried different monitors,mouse and even drivers with no luck.

 

Going single card and everything is fine here

 

But again most have success

 

Michael Moe

 

+1

Maybe this is affecting more the earlier 780 users than the newer 9xx GPUS.

980s as well are being affected.  I have found that by selecting Single GPU in NVCP, both GPUs are working at about equal levels (20-40%) and my frame rate is much better. 

 

Note: I'm running Win 10 10130, and am using the NVIDIA Win 10 drivers, 352.86. 

So i am not the only one? No offence but i am glad to hear that.

 

Hard to judge the hardware when i have so good performance in GTAV and project cars.

 

Again hopefully we will se an improvement later.

 

Michael Moe

So i am not the only one? No offence but i am glad to hear that.

 

Hard to judge the hardware when i have so good performance in GTAV and project cars.

 

Again hopefully we will se an improvement later.

 

Michael Moe

 

By no means it's a hardware problem... SLI in RoF, BoS and DCS is working like a charm in terms of performance. I don't know if there are bugs like the fx ones in P3D in those sim platforms but I am able to put all settings to max and run the sims at 60 fps with vsync on.

 

The issue in P3D is at driver level I suppose... and P3D still being a dog to CPU's and GPU's in terms of optimization.

 

Till now you are the first user I see reporting the exact same issues I am having with 780’s + SLI + P3D v2.5. Some people are claiming increases of 15% ++ which I would love to achieve without spending a dime in a stupid new gen GPU that will not be used at its full potential…

Okay just a quick heads up about this SLI issue and my lack of performance increase.

 

First i must admit something. I am on 353.30 now and did a test in EKCH C37 with the PMDG 777-200LR Air Canada.

 

Almost everything cranked up and SLI indicator inside P3D was working,

 

In Cokpit i see no FPS gain as i dont know if i am supposed to but taking a 360 degrees tour around the airport with these settings i whent from MAX 51 fps to 73 fps (looking at the new eastern tower)

 

Same experience otherwise around so thats a major increase. I had VSYNC off for the test.

 

I use 4x SGSS as 8xMS inside P3D at the test. 

 

Inside the 777 i have 34-35 fps at gate C37 up and running with default panel state and 20% Mytraffic. This is totally the same not in SLI (dont know why ? )

 

But undocking and right mouseclick seems to unsync SLI and sometimes i can not recover.

 

So using FMC,PFD etc is a no go for now but i might use SLI for my GA flights for now

 

So what GPU settings can i use without hitting my VAS to much ?

 

I know AA from NI  (4xSGSS is a keeper ) (Webmaximus :-) )

 

Thanks

Michael Moe