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Frey Apr 10, 2017 @ 10:23pm
sli PCIe x16/x16 vs x8/x8 gtx 1080ti
Hello,
My motherboard has only sli with x8/x8 and i will have SLI gtx 1080ti.
Is there a real difference with x16/x16 ?

Do i need to upgrade with new motherboard sli x16/x16 ?

I have bought a 40" 4k pc monitor, and to play ultra with AA, i need SLI cause only one gtx 1080ti Is not enough

Last edited by Frey; Apr 11, 2017 @ 1:53am
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Showing 1-10 of 10 comments
Squirrell Apr 10, 2017 @ 10:57pm 
Sell the ti, buy a Titan Xp ??? Possibly better than buying a new mobo and another ti. Or wait for vega. There is no guarantee that sli will improve performance.
Last edited by Squirrell; Apr 10, 2017 @ 10:59pm
#1
CursedPanther Apr 10, 2017 @ 11:07pm 
Current generation GPU hasn't quite hit the PCIe 3.0 x8 bandwidth limit yet so you're good. Maybe the Volta cards will come with PCIe 4.0 anyway.
#2
Omega Apr 10, 2017 @ 11:26pm 
It will run in either 16/16 or 8/8 depending on how many PCI lanes your CPU has.
#3
oobymach Apr 10, 2017 @ 11:39pm 
There is only a couple fps difference between x8/x8 and x16/x16

http://www.gamersnexus.net/guides/2488-pci-e-3-x8-vs-x16-performance-impact-on-gpus

https://linustechtips.com/main/topic/502425-x16x16-vs-x8x8-sli-resultsawkward/
Last edited by oobymach; Apr 10, 2017 @ 11:41pm
#4
Frey Apr 11, 2017 @ 1:49am 
Ok thanks all.
I will post you all framrates with sli gtx 1080ti.

And i wont buy titan xp !

For 500€ more and 10% better for titan Xp.
Sli is maybe 30% performance more for 900€.

Originally posted by Omega:
It will run in either 16/16 or 8/8 depending on how many PCI lanes your CPU has.

I7 6700k.

I can upgrade to i7 7700k if it better.
Last edited by rotNdude; Apr 11, 2017 @ 10:26am
#5
Omega Apr 11, 2017 @ 2:00am 
6700k and 7700k both have 16 PCI lanes if you run SLI both cards will run at 8x.
#6
Frey Apr 11, 2017 @ 2:26am 
Originally posted by Omega:
6700k and 7700k both have 16 PCI lanes if you run SLI both cards will run at 8x.

Thank you.
#7
Arvaos Apr 11, 2017 @ 3:02am 
I would definitely recommend 28 lanes if you plan to run a 1080Ti SLI. 8x will cause a performance impact in certain games due to the bandwidth bottleneck as shown in this video. Many people commenting above are not taking into account the SLI configuration which is a different matter entirely.

https://www.youtube.com/watch?v=HchSu5peIoc
Last edited by Arvaos; Apr 11, 2017 @ 3:27am
#8
x_wing Apr 11, 2017 @ 4:09am 
Originally posted by ✪Koly™:
Ok thanks all.
I will post you all framrates with sli gtx 1080ti.

And i wont buy titan xp !

For 500€ more and 10% better for titan Xp.
Sli is maybe 30% performance more for 900€.

Or no performance boost at all. SLI is a very driver-game related feature. If you ask me, I would save the money to buy Nvidia or AMD next gen update.
#9
Frey Apr 11, 2017 @ 5:03am 
Originally posted by x_wing:
Originally posted by ✪Koly™:
Ok thanks all.
I will post you all framrates with sli gtx 1080ti.

And i wont buy titan xp !

For 500€ more and 10% better for titan Xp.
Sli is maybe 30% performance more for 900€.

Or no performance boost at all. SLI is a very driver-game related feature. If you ask me, I would save the money to buy Nvidia or AMD next gen update.


i have already gtx 1080ti, and next gen i will upgrade, dont worry, i had all gpu since gtx 8800 :D !
and no thanks for amd, nvidia is in the way i like.

in game i play, SLI is very usefull.....it will help me to have constant 60fps in 4k ultra.
and at this level of graphics, it's just amazing, all is just so beautifull and smooth !!!
Last edited by Frey; Apr 11, 2017 @ 5:05am
#10
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All Discussions > Steam Forums > Hardware and Operating Systems > Topic Details
Date Posted: Apr 10, 2017 @ 10:23pm
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