GTX 1080 TIs & SLI = No Joy

Any issues, problems or troubleshooting topics related to computer hardware and the Prepar3D client application
otown
Posts: 1
Joined: Thu Apr 13, 2017 1:21 am

GTX 1080 TIs & SLI = No Joy

Postby otown » Thu Apr 13, 2017 11:59 am

Apologies if this is the wrong forum.

Just picked up a pair of new GTX 1080 TIs and a HB SLI bridge.

Plugged in and booted up P3D (v.3.4.22.19868 - latest build)...no obvious difference in FPS between SLI and single card at default OR max settings, full-screen or windowed. I get slightly better FPS with a single card! (45-50 FPS SLI vs. 50-60 FPS single card)

SLI works fine. Confirmed w/ benchmarks.

Deleted and reinstalled latest drivers (381.65). No Joy. Rolled back to 378.78. No joy. Can't roll back to the popular 376.33, won't recognize 1080 TI.

Deleted and reinstalled P3D. No joy.

Assuming it's a driver/card issue and I'm out of luck but want to make sure I'm not missing something...? I should have more than enough CPU/RAM muscle. Thanks! :)

Win10 x64, 5960x @ 4.0 GHz, 32gb DDR4, Samsung 960 Pro SSD

CptVince
Posts: 3
Joined: Thu Mar 02, 2017 4:43 am

Re: GTX 1080 TIs & SLI = No Joy

Postby CptVince » Thu Apr 13, 2017 8:04 pm

Same issue here with my two 1070's. Running one card I get better performances than with SLI. Very depressing..

MurisSaab
Posts: 8
Joined: Sun Apr 02, 2017 1:57 am

Re: GTX 1080 TIs & SLI = No Joy

Postby MurisSaab » Thu Apr 13, 2017 11:07 pm

I have the same issue with my dual GTX 1080, using either 376.33 or the latest

With SLI enabled, each card loads is no higher than 40%

With SLI disabled and P3D using a single GPU, the GPU load is no higher than 60%

In both cases my CPU load is about 30%

seems like FPS are hit before the GPU load is maximized

Would appreciate any advice

CTVredvirus
Posts: 124
Joined: Thu Sep 19, 2013 7:54 pm

Re: GTX 1080 TIs & SLI = No Joy

Postby CTVredvirus » Thu Apr 20, 2017 6:10 am

P3D as FSX is cou bound,ostly on first core and so adding another graphic card wont make a difference, and of whati know P3d does not support SLI.
OCZ Gold 1250W, Evga z170 Classified, Skylake i76700k @ 4.5Ghz, 16GB Ram, 2x GTX 1070 (8GB).
P3D addons: ASN, RASS PRO, FS2CREW, UT2, PFPX. P3Dv3 and 4

CTVredvirus
Posts: 124
Joined: Thu Sep 19, 2013 7:54 pm

Re: GTX 1080 TIs & SLI = No Joy

Postby CTVredvirus » Thu Apr 20, 2017 6:11 am

P3D as FSX is mostly bound on first cpu core and so adding another graphic card wont make a difference, and of whati know P3d does not support SLI.
OCZ Gold 1250W, Evga z170 Classified, Skylake i76700k @ 4.5Ghz, 16GB Ram, 2x GTX 1070 (8GB).
P3D addons: ASN, RASS PRO, FS2CREW, UT2, PFPX. P3Dv3 and 4

Saldo
Posts: 221
Joined: Thu Sep 18, 2014 7:26 am

Re: GTX 1080 TIs & SLI = No Joy

Postby Saldo » Thu Apr 20, 2017 2:05 pm

P3D does support SLI till a certain degree.

Without AA the difference is about 5%.
But with 4x SGSS enabled it helps holding the framerate instead of dropping way down. Especially with clouds .
Then 1 card compared to SLI dropps till almost 60% of the fps.

See Rob A's P3D guide at the P3D forum from Avsim for testing results.

MurisSaab
Posts: 8
Joined: Sun Apr 02, 2017 1:57 am

Re: GTX 1080 TIs & SLI = No Joy

Postby MurisSaab » Thu Apr 20, 2017 8:25 pm


See Rob A's P3D guide at the P3D forum from Avsim for testing results.
Do you have the link? Thanks

coopville
Posts: 6
Joined: Tue May 23, 2017 12:05 am

Re: GTX 1080 TIs & SLI = No Joy

Postby coopville » Fri May 26, 2017 10:58 pm

I think this might be the guide he is referring too:

[url]https://www.avsim.com/files/file/87-avs ... r3d-guide/

Coop


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