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dose sli add input lagG?

post #1 of 26
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hey am new to this site but i was wondering if sli cause input lagg i want to game at 1440p but to do so i need sli gtx 970 . input lagg really annoys me i can tell the different from 10-50 ms lag very easy and if there is input lag dose g sync get rid of sli input lag.

right now am geting alot of lagg from v sync so i am planing to buy a 144hz g sync from asus the rog swift or a benq 1080p g sync monitor id like to go to 1440p but if that means i need sli and from what iv been reading on fourms people say it adds lagg but all the fourms from 2012 nothing to new

id like 1440p but if thier is alot of input lagg id rather stay at 1080p with 1 carde
my set up
i7 4790k
asus gtx 970
8gb of corsair ram (2133)
mobo msi z97
power supply 750 watt

2e0pzf4.jpg
Edited by soulslayero - 5/23/15 at 10:16am
post #2 of 26
I can't answer that question because i have no experience with SLI and the recent improves in V-sync (g-sync).
What i can tell you is that i read a little trick here about 2 years ago and i have been using it ever since.
Whenever you turn on V-sync to eliminate screen tearing, i set my FPS limit to max -1
So in my case, with a monitor of 60hz, i set my FPS to 59 with Vsync enabled, this allows me to enjoy a screen tearing free display without input lag.
Works everytime.

Just a little something that might end up being helpful.
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post #3 of 26
Haven't noticed any input lag caused by sli personally.
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post #4 of 26
It adds at least 1 more buffered frame per extra card, to synchronize ram content between cards. Least with Alternate frame rendering mode, which is the standard.

edit: Also frametime might go up as well. If you increase settings. For framerate, it's ok to have twice the frametime with 2 GPUs rendering different frames at the same time and still get same FPS as with lower settings but single card, though this would be some extra input lag as well.

my 2 cents, if you're concerned about input lag, avoid multi GPU setups till AFR is history. (DX12 might help establish better modes)

edit: These things might not be very noticeable if you pull enough FPS, though. But they definitely increase the input lag compared to a single card setup that pulls the same FPS.
Edited by Tivan - 5/23/15 at 10:45am
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post #5 of 26
in some games if you could reach above 3,5GB of vram the card could have sttutering, that wouldbe worse than input lag
post #6 of 26
Quote:
Originally Posted by PontiacGTX View Post

in some games if you could reach above 3,5GB of vram the card could have sttutering, that wouldbe worse than input lag

Yeah i second this. However, then the options become rather limited to either going for a Titan or the far cheaper 290X which would get my vote.
Unless i am missing out on any other card that has more then 4GB of Vram aboard?
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post #7 of 26
Quote:
Originally Posted by unseen0 View Post

Yeah i second this. However, then the options become rather limited to either going for a Titan or the far cheaper 290X which would get my vote.
Unless i am missing out on any other card that has more then 4GB of Vram aboard?
290,incoming hawaii replacement, amd fiji and the 980ti,980
post #8 of 26
Thread Starter 
should i just wait for 4k to become cheaper and just stick with 1080p? and upgrade other things in my pc for now? like 16gb of ram 1tb ssd better power supply sound card?
post #9 of 26
Quote:
Originally Posted by soulslayero View Post

should i just wait for 4k to become cheaper and just stick with 1080p? and upgrade other things in my pc for now? like 16gb of ram 1tb ssd better power supply sound card?

In my opinion, 1440P is a setback from 1080p. Performance/Quality.
Stick with what you have. I don't see a need for 16GB ram yet unless you're running multiple programs at once.
As for soundcard, that could be usefull if you really want that "high-end" sound. However, i'd only recommend this if you're listening to music 24/7 and have a good headset to go with it.
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post #10 of 26
100-110fps-ish with SLI and alternate frame rendering has the same input lag as ~50fps with single card.

It's not really that SLI -increases- input lag, it's that it does not DECREASE it.

If you get a single GPU that's way more powerful and go from 50fps to 100fps, your GPU frametime will drop from 20ms to 10ms and you'll lose that 10ms of input lag.

If you get two cards, you'll still have a 20ms GPU frametime, you just have two GPU's working at the same time. The time from your input to the GPU output is unchanged. You'll have a smoother image, but that's all.


Faster single GPU = enhanced smoothness, lower input lag

more GPU's = enhanced smoothness, same input lag


it's very bad to run multi-GPU, particularly 3 or 4 GPU's in many situations - if a single GPU can only handle it at 20fps, using four GPU's to get that to 60fps will still leave you with the input lag of ~20fps. It'd be awful. For someone just looking to optimize for input lag, they'd take a strong bias away from even two GPU's.
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