What is the total max amount of displays a 4090 can support @4k?

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You would think this was a streightfoward thing but it really kinda isnt. When I was looikn on websites it list the maximum digital resolution as 7680x4320 …

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Edited

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It can definitely support four.

If you add some kind of displayport multi-stream adapters you might be able to connect more - each displayport connection can support two 4k displays in isolation with these, but it isn’t clear if these will still work with a fully populated card.

So perhaps seven, but without confirmation :man_shrugging:

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So i can tell you with confidence that the card will not allow you to connect more than 4 monitors due to nvidia driver limitations. The question I have is , what can the resolutions on those 4 monitors be?

For example, 4 Standard 1080p monitors would be fine. 4 1080p monitors at 120htz would likely be fine as well…but 4 1080p monitors at 240htz…maybe not.

4k @ 240 hrtz as far as the gpu’s abliity to push pixels is a lot more similar to 8k then it is 4 1080p monitors and this card can only support 1 8k monitor to my knowledge.

So figuring out exactly what the details are without doing testing is kind of difficult.

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From the 4090 spec page (NVIDIA GeForce RTX 4090 Graphics Cards)

4 - Multi Monitor:

  • 4 independent displays at 4K 120Hz using DP or HDMI
  • 2 independent displays at 4K 240Hz or 8K 60Hz with DSC using DP or HDMI
  • Other display configurations may be possible based on available bandwidth
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Thank you…The moment i see the nvidia spec page and its flashy UI my mind turns off.

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It’s not a driver/software limitation; it’s hardware.

The main thing is the limit of display controllers/clock generators on the GPU core.

The general rule was that NVIDIA had 4, Intel had 3 for earlier IGPs around 10th gen and lower at least for GT2; they have 4 right now I believe, and AMD had 6, at least for until Navi 10; I think that’s down to 4 now, but someone correct me if I’m wrong. Apple Silicon has 2 for base M1/M2/M3.

The main thing is the GPU core can’t drive more displays than it has controllers. The exception is Displaylink but that doesn’t count.

If you had a core could run 6, but only had 4 display connections, you could use a 3 port MST hub to get 6; provided that you stay within the limits of one DP connection for those 3 displays. Same thing goes with laptops assuming the display out ports were wired into the correct GPU cores.

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4 Displays per gpu makes sense for Nvidia and has been that way a long time.I always thought it was hardware but didn’t know 100% for sure. The nvs 810 has a dual gpu design and can do 8 monitors so that all tracks.

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How can I achieve this… I have a RTX 4090 with an i9 14900KF and 64 GB of RAM… I am only able to get 3 monitors to work at the same time…

  1. Samsung QCQ90S 55" 60Hz
  2. 27" ASUS Predator XB273U 60Hz
  3. 27" ASUS XF273 S 144Hz
  4. 27" ASUS XF273 S 144Hz - But this one will not display anything.

Any ideas would be better than the last 7 systems that Dell has tried to send me as a replacement. I know this works, as I had all 4 monitors working for some time, before Dells techs got their hands on my system…

THANK YOU!

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Don’t use MST if you don’t have to. Directly connect all displays to the video card.

By the way, those displays are Acer, not Asus.

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My 970 supports my super old 120hz 3d ready acer. : ( lol