I also think the balancing is a key. On my 7900X & 1080TI setup, the CPU is usually at 100% or there, the GPU not so much. 

Perhaps the settings are not balanced or perhaps the OC's of both is not a match, hard to tell.

Edited November 13, 20187 yr by Vali

2 hours ago, w6kd said:

ut an 8-core 9900K just might start to max out the busses with 2X 2080Ti at 8x/8x

Yeah, typically there will be about 10-12% FPS drop (in 3D shooters) going from 2X16 to 2X8 PCIe with SLI ... not sure about NVLink/SLI?

Cheers, Rob.

22 hours ago, Ray Proudfoot said:

Without wishing to be disrespctful what you have posted above is totally meaningless without knowing your hardware. PLEASE put it in your signature.

Done.

Below are my settings and screenshots in the most demanding situation I could imagine to put my 2080 Ti to the test: DD KSEA, 16L, in the FSLabs A319 at dusk, engines running, all exterior lights on with dynamic ramp lighting also visible. Also have DD Seattle X, ORBX NA PNW, OLC NA lights active as well.

Historical WX:

KSEA 031529Z 22011KT 8SM -RA BKN008 OVC013 

Settings:

Capture by Ben, on Flickr

Capture1 by Ben, on Flickr

Capture2 by Ben, on Flickr

Capture3 by Ben, on Flickr

For the sake of this exercise, I turned off VSync/Triple Buffering (always run VSync/Triple Buffering/30hz when flying):

Prepar3D Screenshot 2018.11.12 - 23.01.51.69 by Ben, on Flickr

Prepar3D Screenshot 2018.11.12 - 22.58.06.79 by Ben, on Flickr

As you can see, I can maintain over 30fps in this scenario (was fluctuating between 33-38). Now, see what happens when I change the AA to SSAA x 4:

Prepar3D Screenshot 2018.11.12 - 23.02.14.20 by Ben, on Flickr

Prepar3D Screenshot 2018.11.12 - 22.58.55.74 by Ben, on Flickr

As you can see, SSAA can still take a toll on my system when put in an already graphically demanding situation. I can fly with SSAA x4 at daytime, and at night into some airports without dynamically lit ramps and still maintain 30fps, however the combination of  4k, dynamic aircraft lights, weather, and dynamically lit airports can still result in less than 30fps. Overall though, I am happy as that isn't a huge compromise for me, and I can otherwise crank up all my GPU-intensive settings. As I said in my earlier post, I have different graphics settings for different scenarios (Day IFR, Day VFR, Dusk, etc.) and go between them in order to maintain smooth 30fps/30hz.

Ben

16 minutes ago, bbain1187 said:

Done,

Ben

Thanks, much appreciated. Nice machine. 😄

On 11/6/2018 at 7:23 AM, GSalden said:

The 2080Ti is performing exactly the same as the 2x 1080Ti SLI combo.

I am reaching the same conclusion.  Actually, the 2080Ti seems a bit smoother...but the scenarios that pushed the twin 1080Tis to the brink (e.g. 4xSSAA and heavy wx) are seeing GPU loads within a few percent (usually lower) than the SLI setup.  And now I can use Trueglass and other add-ons that use the P3D PDK without the flashing problems that were present with the SLI setup.

At this point, I don't think the improvements that I'd see with a second 2080Ti would be worth going back to constantly dealing with the SLI hassles.  This card looks to be a pretty optimum match for P3Dv4 and a 4K display.

Regards

Why do people use SSAA and 4K?  Isn't that complete overkill?  I can still read the full eye chart at my doctor's office and I don't feel there is any difference in everyday use.  Is it just for the shimmering in the distance sometimes?

4 hours ago, TravelRunner404 said:

Why do people use SSAA and 4K?  Isn't that complete overkill? 

No, not overkill at all.

The need for AA varies with the size of the individual pixels relative to the viewing distance.  When the pixel's size is below the visual acuity threshold--the point where the angular width of an individual pixel is wide enough that your eyes can resolve it separately from its neighbors, then use of AA to smooth the jaggies out is pointless, as you can't see them anyway.  So a small (say 32") 4K monitor viewed at 36" eye-to-screen distance may need no AA at all.  However a 55" 4K monitor at the same viewing distance does need AA, since the pixels on the larger screen are large enough for the eye to resolve individually (and therefore so are the jaggies formed by those individually-visible pixels as well).

I use a 55" 4K display at 39" viewing distance in order to get the panel display close to life-size (the display units on the PMDG 737 are ~85% of life size).  AA makes a noticeable difference with a display of this size at this viewing distance.  If I were to either go down to a 40" display or move back away from the 55" screen, then I may not need AA...but then again I will also have defeated my intended purpose of trying to replicate a near life-size panel at close to the same approximate viewing distance as a real instrument panel.

Regards

12 hours ago, TravelRunner404 said:

Why do people use SSAA and 4K?  Isn't that complete overkill?  I can still read the full eye chart at my doctor's office and I don't feel there is any difference in everyday use.  Is it just for the shimmering in the distance sometimes?

Yes, the main issue for me is shimmering of Orbx road lights at night. The 4x SSAA virtually eliminates jaggies which is pretty noticeable and impressive on a 4k display even in the daytime. And I sit about 3 feet from my 40 inch display.

Ben 

The shimmering is pretty bad overall and I can see why you’d want to get rid of that. I do notice less without SSAA but personally it’s not worth the performance drop even on my 1080ti but the perfectionist in me does notice it.

Isn’t SSAA the most blunt technique for anti-aliasing? I have read a little bit on it and it seems it’s the most inefficient but in a way that makes it the best? Is it a P3D choice that it only allows MSAA and SSAA and not more of the modern techniques? But I also get the impression modern techniques all have issues right?

On 11/16/2018 at 12:54 PM, w6kd said:

I am reaching the same conclusion.  Actually, the 2080Ti seems a bit smoother...but the scenarios that pushed the twin 1080Tis to the brink (e.g. 4xSSAA and heavy wx) are seeing GPU loads within a few percent (usually lower) than the SLI setup.  And now I can use Trueglass and other add-ons that use the P3D PDK without the flashing problems that were present with the SLI setup.

At this point, I don't think the improvements that I'd see with a second 2080Ti would be worth going back to constantly dealing with the SLI hassles.  This card looks to be a pretty optimum match for P3Dv4 and a 4K display.

Regards

Thank u for your report.  I would like to ditch my 1080ti SLI setup and go to a single 2080ti.  Do u still consider that a positive upgrade?  I like my SLI but the Realight issues are very annoying.

12 hours ago, mpw8679 said:

Thank u for your report.  I would like to ditch my 1080ti SLI setup and go to a single 2080ti.  Do u still consider that a positive upgrade?  I like my SLI but the Realight issues are very annoying.

It's not a major performance boost over the 2x 1080Ti SLI I had before, but yes, the move away from complexity, lack of compatibility issues with newer PDK-based features like RealLight, TrueGlass, and GSX2, and eliminating the ever-present risk of another batch of potentially buggy drivers that break SLI, all make it a positive move forward.  I've had several drivers along the way that actually caused the SLI options to disappear from the nVidia Control Panel, and a driver rollback did not fix it, forcing a complete system restore from backup to get my SLI config working again.  For the most part, SLI does work, but it's a messy, inefficient and brute-force approach, and it always seems to require serious compromises.  I did SLI with a pair of 980Tis, and then again with a pair of 1080Tis.  I'm finally where I wanted to be w/r/t performance with the single 2080Ti now.

Regards

 

 

16 minutes ago, w6kd said:

It's not a major performance boost over the 2x 1080Ti SLI I had before, but yes, the move away from complexity, lack of compatibility issues with newer PDK-based features like RealLight, TrueGlass, and GSX2, and eliminating the ever-present risk of another batch of potentially buggy drivers that break SLI, all make it a positive move forward.  I've had several drivers along the way that actually caused the SLI options to disappear from the nVidia Control Panel, and a driver rollback did not fix it, forcing a complete system restore from backup to get my SLI config working again.  For the most part, SLI does work, but it's a messy, inefficient and brute-force approach, and it always seems to require serious compromises.  I did SLI with a pair of 980Tis, and then again with a pair of 1080Tis.  I'm finally where I wanted to be w/r/t performance with the single 2080Ti now.

Regards

 

 

Thank u!

So, for those who still run a single 1080Ti in 2k resolution, there is no sense to make a swap to 2080Ti as the performance's increase is negligible. Is that correct? 

 

Thanks

Dmitriy

On 11/23/2018 at 6:44 PM, w6kd said:

It's not a major performance boost over the 2x 1080Ti SLI I had before, but yes, the move away from complexity, lack of compatibility issues with newer PDK-based features like RealLight, TrueGlass, and GSX2, and eliminating the ever-present risk of another batch of potentially buggy drivers that break SLI, all make it a positive move forward.  I've had several drivers along the way that actually caused the SLI options to disappear from the nVidia Control Panel, and a driver rollback did not fix it, forcing a complete system restore from backup to get my SLI config working again.  For the most part, SLI does work, but it's a messy, inefficient and brute-force approach, and it always seems to require serious compromises.  I did SLI with a pair of 980Tis, and then again with a pair of 1080Tis.  I'm finally where I wanted to be w/r/t performance with the single 2080Ti now.

Regards

 

 

I have 1080 Ti SLI too.  But I do not notice the increased performance. (Compared with one 1080Ti)      What settings did you use to make  SLI add power?

 

 

I run a 30Hz 4K TV for a monitor, with VSync.  With the SLI config, increased performance meant holding frame rates at 30 fps in heavy weather and with SSAA in scenarios where the single 1080Ti would hit the wall near 100% GPU utilization and frame rates would drop.

As far as settings, off the top of my head I had SLI enabled in nVidia CP, in P3D 4xSSAA (daytime) DL off or 4xMSAA (nighttime) DL on, unlimited fps, 16x AF, and not much else.  No nVidia Inspector tweaking or other settings.

Regards