4x Monitors but it will only display 3 no matter what I do.

[MrSimplicity]

So I just picked up a Samsung Odyssey Oled G9 (5120x1440 240hz) as I've never had a monitor that was more than $250. Figured it was about time I spoil myself. Anyways, I also have 3x AOC CQ27G2 (2560x1440 144hz) monitors and am unable to get all 4 monitors to work at the same time. I have a ASUS ROG STRIX 3090 so I feel like I shouldn't have an issue pushing the pixels. I did read somewhere that there's a hard limit in the graphics driver that's like 2 x 4k. Not sure the truth behind that but it seeming plausible. With all 4 displays I think it's running roughly 5 x 2k? which I guess is technically 2.25 x 4k? I've tried dropping the resolution on the AOC monitors to all 1080p but that didn't work so I'm thinking it's not just a pixel limit. Anyone ever run into this kind of issue and know of a fix?

[wONKEyeYEs]

33 minutes ago, MrSimplicity said:

3x AOC CQ27G2 (2560x1440 144hz)

Resolution-Digital Max Resolution 7680 x 4320

https://rog.asus.com/graphics-cards/graphics-cards/rog-strix/rog-strix-rtx3090-24g-gaming-model/spec/

[MrSimplicity]

16 minutes ago, wONKEyeYEs said:

Resolution-Digital Max Resolution 7680 x 4320

https://rog.asus.com/graphics-cards/graphics-cards/rog-strix/rog-strix-rtx3090-24g-gaming-model/spec/

Okay, so I'm still under that then. My technical resolution is (7680x2880) but with a corner cut out out it. essentially 7680x1440 and 5120x1440

[MrSimplicity]

So I maybe got it working? I just had to utilize Intel's virtualization tech... I.E. plugged my 4th monitor into my M/B. It did randomly turn itself off on me so we'll see if it holds up. Still not sure why this exactly worked being that it is technically passing the GPU display out to the M/B's display out.

[problemsolver]

48 minutes ago, MrSimplicity said:

Okay, so I'm still under that then. My technical resolution is (7680x2880) but with a corner cut out out it. essentially 7680x1440 and 5120x1440

It would seem that your issue is definitely a thing.

 

After looking around and reading a lot more, it would seem this is how it works:

 

The maximum digital resolution is the max the card is capable of on one output.  Since DP 1.4 supports 7680 x 4320, that's the max resolution for one output.  Each output is separate... and so TL;DR what you're doing should work.

 

But it doesn't.

 

Check if you have resizable bar enabled:  Nvidia Control Panel >> Settings >> System Information

 

If it's off, I would recommend updating to the latest VBIOS first and then turning on resizable bar in your motherboard BIOS.

 

Doubt that will fix it, but it's a good first shot since the people that have issues likely have issues on the PCI-E path of devices.

 

The text below written by me is all TOTALLY WRONG
 

Quote

 

No, you were exceeding the resolution available as follows:

 

[2560 x 1440]  + [2560 x 1440] + [2560 x 1440] + [5120 x 1440] = 12800 x 5760

Remove one AOC and:  [2560 x 1440] + [2560 x 1440] + [5120 x 1440] = 10240 x 4320

Your GPU can't support more than 7680 pixels in the horizontal direction and no more than 4320 in the vertical direction.

 

[problemsolver]

Wait a minute... you don't have a riser cable... do you?  If you do, you also need to remove that & test without it.

Sorry, I forget those are a thing and are used by a lot of people... and cause a lot of problems

[MrSimplicity]

4 hours ago, problemsolver said:

Wait a minute... you don't have a riser cable... do you?  If you do, you also need to remove that & test without it.

Sorry, I forget those are a thing and are used by a lot of people... and cause a lot of problems

I do not have a riser cable. My GPU wouldn't fit vertically in my case anyways.

[MrSimplicity]

*UPDATE* If I turn my PC on with all 4 displays connected it sets every display to 2560x1440 and if I change the G9 to 5120x1440 I get a BSOD. Which as I mentioned before it seems to be the driver's hard limit. At this point the only option that I think I have available is to get some sort of display link to run the 3 monitors on. since apparently you can run, like... a lot of monitors with display link.

[problemsolver]

4 hours ago, MrSimplicity said:

*UPDATE* If I turn my PC on with all 4 displays connected it sets every display to 2560x1440 and if I change the G9 to 5120x1440 I get a BSOD. Which as I mentioned before it seems to be the driver's hard limit. At this point the only option that I think I have available is to get some sort of display link to run the 3 monitors on. since apparently you can run, like... a lot of monitors with display link.

You shouldn't get a BSOD.  What's the error?

 

Have you run a memtest on your GPU?

[MrSimplicity]

18 hours ago, problemsolver said:

You shouldn't get a BSOD.  What's the error?

 

Have you run a memtest on your GPU?

Something to do with a driver. I got it a couple times but it didn't stay up long enough for me to read the whole thing.

[problemsolver]

16 hours ago, MrSimplicity said:

Something to do with a driver. I got it a couple times but it didn't stay up long enough for me to read the whole thing.

Have you updated to the latest driver?

[MrSimplicity]

13 hours ago, problemsolver said:

Have you updated to the latest driver?

Honestly, all I think it really is, is that windows, the driver, or what not is just counting the G9 as 2 monitors. Which I think it technically is 2 panels. Not necessarily 2 physical panels but just in the firmware/software of the monitor itself which then relays to windows.

[problemsolver]

On 8/12/2023 at 7:47 AM, MrSimplicity said:

Honestly, all I think it really is, is that windows, the driver, or what not is just counting the G9 as 2 monitors. Which I think it technically is 2 panels. Not necessarily 2 physical panels but just in the firmware/software of the monitor itself which then relays to windows.

Well, easy to test that theory, what shows up here: 4 monitors and you can run whatever resolution you want on 'half' of the G9?

[problemsolver]

I finally found something that might actually be useful... buried in the release notes of the nvidia drivers (quoted below, sourced from here)

 

By omission, the RTX 40-series should obviously do what you're trying to get it to do as no bandwidth limitations are mentioned for RTX 40 series cards.

 

Just for troubleshooting purposes, I would try setting everything at 60 Hz and seeing if you can get all the monitors working then.
 

Quote

The maximum number of HDMI or DisplayPort displays that an NVIDIA GeForce RTX 30- series or RTX 20-series GPU can drive at the same time may be limited to two displays under the following conditions:
 
NVIDIA GeForce RTX 30-series GPUs
• When driving a Display Stream Compression (DSC) - capable DisplayPort or HDMI display where the horizontal resolution is greater than 5120 pixels or that requires high clock bandwidth; for example, 3840x2160 @ 160 Hz.
• When driving a YCbCr 4:2:0 HDMI display where the horizontal resolution is greater than 5120 pixels or that requires high clock bandwidth; for example, 3840x2160 @ 160 Hz.

Similarly, NVIDIA GeForce RTX 20-series GPUs
• When driving a Display Stream Compression (DSC) - capable DisplayPort display where the horizontal resolution is greater than 5120 pixels or that requires high clock bandwidth; for example, 3840x2160 @ 160 Hz.

 

[MrSimplicity]

On 8/22/2023 at 10:20 PM, problemsolver said:

I finally found something that might actually be useful... buried in the release notes of the nvidia drivers (quoted below, sourced from here)

 

By omission, the RTX 40-series should obviously do what you're trying to get it to do as no bandwidth limitations are mentioned for RTX 40 series cards.

 

Just for troubleshooting purposes, I would try setting everything at 60 Hz and seeing if you can get all the monitors working then.
 

 

that would be awesome but I have a 3090 not a 40-series. I will try giving that a shot when I'm home again though.

[problemsolver]

2 hours ago, MrSimplicity said:

that would be awesome but I have a 3090 not a 40-series. I will try giving that a shot when I'm home again though.

Oh shoot! Then that is probably the issue!

Sorry, I forgot to refresh my memory on which GPU you have.  Let us know how it goes.