RTX2080Ti SLI problem

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pandaaviation
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RTX2080Ti SLI problem

Postby pandaaviation » Thu Oct 25, 2018 5:30 pm

Good morning all,
I replaced my current workstation from TITAN V to RTX 2080 Ti 2 way-Sli. Then I had a problem that I had never experienced before.

That trouble is,While running Prepar3d with SLI enabled, it will suddenly down the PC within 40 minutes.
Of course it can be thought of as being caused by hard things like my psu and gpu. However, other programs such as 3DMARK's stress test, CINEBENCH, OCCT, and DCS sim also worked well in the more loaded environment.
And I disabled sli from the control panel. Then troubles so far no longer occur like a lie.
RTX 2080 Ti is a conventional SLI. And I use Nv-link for the structure, is it affecting P3D?
Does anyone know?

P3D:V4.3.29.25520
CPU:core i9 7980XE
MoBo:WS X299 SAGE
RAM:DDR4 64GB
GPU:RTX2080Ti FE 2Way-SLI
SSD:intel DC P4510 2TB
PSU:CoolerMaster V1200
OS:Windows10 64bit pro

thanks

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Rob Ainscough
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Re: RTX2080Ti SLI problem

Postby Rob Ainscough » Thu Oct 25, 2018 8:09 pm

I have two 2080Ti FE's running P3D V4.3 without issues for long durations.

I would recommend you provide more information as to what "suddenly down" means?

If what you experience is one of these:
  • CTD (crash to desktop) - then check the OS event log and report any listing specific to P3D
  • Blue screen - then this is likely an overclocking issues (either GPU or CPU) or cooling issue
  • Spontaneous system reboot - this is very likely a power issue (supply is not strong enough)
The nVidia 2080Ti FE's run very hot, so make sure you have adequate cooling ... they run so hot that they can actually impact CPU temps.

Cheers, Rob.
Rob Ainscough http://www.p3dWiki.com
Prepar3D Forum Global Moderator

pandaaviation
Posts: 22
Joined: Mon Jul 17, 2017 5:50 am

Re: RTX2080Ti SLI problem

Postby pandaaviation » Sun Oct 28, 2018 4:37 pm

Thank you for your quick response. My "suddenly down" is the Spontaneous system reboot. I think that PSU power is still sufficient even now, but I will add 1200 W PSU and give total 2400 W to PC when setting to water cooling.
Since SLI at P3D is not very effective at this time, I disable it for a while and let's enjoy it.

Thanks. and keep flying!!
have a nice day

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downscc
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Re: RTX2080Ti SLI problem

Postby downscc » Sun Oct 28, 2018 5:18 pm

Thank you for your quick response. My "suddenly down" is the Spontaneous system reboot. I think that PSU power is still sufficient even now, but I will add 1200 W PSU and give total 2400 W to PC when setting to water cooling.
Since SLI at P3D is not very effective at this time, I disable it for a while and let's enjoy it.

Thanks. and keep flying!!
have a nice day
The unexpected reboot is power related. Perhaps power supply or perhaps something on the mobo. I doubt you need 1200 W, I'm running 2x 1080Ti with 8700K on liquid cooling with 850W and i rarely see it exceed 600W. Get some diagnostics running and keep and eye on voltages and temps. I use HWiNFO for exactly this kind of stuff.
Dan Downs
KCRP

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Rob Ainscough
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Re: RTX2080Ti SLI problem

Postby Rob Ainscough » Sun Oct 28, 2018 5:26 pm

On my main Flight Sim PC I use an EVGA 1600W T2 to drive a 7900X and two 2080Ti.

You should see a significant increase in performance with two 2080Ti's in P3D V4.x provided you are NOT CPU limited. I saw about a 97% FPS increase in 2X 2080Ti vs. 1X TitanXP.

Cheers, Rob.
Rob Ainscough http://www.p3dWiki.com
Prepar3D Forum Global Moderator

alphainfinity
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Re: RTX2080Ti SLI problem

Postby alphainfinity » Thu Feb 14, 2019 12:53 am

Rob,

I know there are other threads out there that provide some SLI settings. A few questions:

1. I have SLI setup for my NVLINK 2080Ti's in the nvidia control panel. IS Nvidia inspector still required to get sli working?
2. Any prepar3d.cfg specific SLI settings that you would suggest in this current version of prepar3d?
3. Once SLI is enabled and I have the recommended settings in the Nvidia control panel and the prepar3d config file, is there a good way to validate that the simulation is working both cards? It would appear as though the SLI visual indicator is not working for me in the sim.


Asus Maximus XI Forula with a 9900k at 4.9 watercooled
32GB RAM
M.2 SSD
X2 2080TI with Nvlink
Thanks,
Scott


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