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NVidia's response to daisy chaining a DP 1.4 complaint card? Don't do it. Huh?

8,209 3,319 June 15, 2020 at 05:21 AM
I have a NVIDIA GeForce GTX 1660Ti on my Desktop. Works butter smooth with three 1440p 75hz monitors (admittedly, I don't game, so keep that in mind - might in the future, but not now). So, I have my "old" 1080 Asus monitor that I wanted to hook up as a fourth monitor, and I also have a HDMi-cat6-HDMI long extension to my HDTV (the tv is 4k, but the extension only pushes 1080). I'd like to run that too, at least have the option. I could even switch between the Asus and TV if 5 monitors is out of the question.

Anyway, the card has three ports: HDMI, Displayport, and D-Sub (VGA). So, since the card is DP 1.4 complaint, I'm like this must support daisy chaining, right?

So I went to the source, to be absolutely certainI contacted NVidia's tech support. I asked if the card supports more than three monitors, using the DP. He didn't have a quick answer, but eventually comes back and says "No, sorry". I'm like "doesn't DP 1.4 support more than one monitor? Your card spec says 1.4 complaint." He says "Yes, but we don't recommend it." Ok, so his answer has changed. Then I say, "so this is because of *possible* performance issues?". He's like "we just don't recommend it." I went a little further with this, since I was a little puzzled. So, "what about three monitors, but all running off DP daisy chaining?" His answer "We don't recommend it."

First of all, wth? Am I missing something? Admittedly, I've never done daisy chaining, so maybe something I'm naive about? It would seem if you put a port on a card that complies with a certain standard, it supports ALL features of that standard. Also, how does 3 DP monitors off that single port, with the same exact monitors, drive the card harder than the same exact monitors off three separate ports?

Everything said, shouldn't the tech be asking me what's my setup also? I'm not running triple or quad 4K at 144 Hz. I'm running mid grade 2K monitors, and they run without a hickup right now, butter smooth, and adding one or two 1080 mid range (not gaming) monitors on the DP is going to fry my card? It would probably barely increase the utilization.

I just don't get it. Any insights? Thanks.

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#2
The support person you spoke with deals with thousands of people with different cards every day. Your card should support daisy chaining however you're still limited to the bandwidth of a single DP cable when daisy chaining. 3 x 1440p 75hz monitors would almost entirely saturate that bandwidth. Daisy chaining is going to increase complexity and latency which is probably why they don't recommend it.
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#3
Quote from NYExcuse
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The support person you spoke with deals with thousands of people with different cards every day. Your card should support daisy chaining however you're still limited to the bandwidth of a single DP cable when daisy chaining. 3 x 1440p 75hz monitors would almost entirely saturate that bandwidth. Daisy chaining is going to increase complexity and latency which is probably why they don't recommend it.
Thanks for the feedback. Well, my example of 3x 75hz 1440p was just an example to him, to test him from another angle. I have no intention of actually having that config. I was going to keep two of the 1440p's on HDMI and D-SUB, and then have the DP run the third 1440p, along with one (or possibly two) 1080 outputs. Based on your comment, that seems like it would be fine? I really only need one 1080 actually, as I could just buy a splitter if I can't run two 1080's.
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#4
So the simple answer is you can do it with DP 1.2, but you cannot drive more monitors that the card supports so if you have 3 now and it supports 3 that is it.

It is possible you "could" split resolutions but i get the feeling it may not work running 4 monitors in a 2x2 configuration.

https://www.displayport.org/cable...rt-output/
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#5
If they can't guarantee that it will work, that's what they'll tell you. If works on your setup but maybe it won't work with a different monitor or when the OS is upgraded, etc. So they'll tell you they can't support the feature.

The Multi Stream feature is optional; it's not required for a DP device to support it.
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#6
Quote from NYExcuse
:
The support person you spoke with deals with thousands of people with different cards every day. Your card should support daisy chaining however you're still limited to the bandwidth of a single DP cable when daisy chaining. 3 x 1440p 75hz monitors would almost entirely saturate that bandwidth. Daisy chaining is going to increase complexity and latency which is probably why they don't recommend it.
Daisy chaining will not impact latency.
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