Connecting 11 monitors to one computer?

Question

Iron

Hello.
I have one big problem that I would like to solve as soon as possible, and I ask you to help me with this.
I need to create a video wall, at the moment of 11 monitors, and these 11 monitors are connected to one computer via 3 video cards (I will describe all the configurations at the bottom).
10 of them hang on the wall, and one stands on the table as an additional monitor (it is also needed).
Here are the video card gateways: 1 HDMI, 1 Display Port, 2 DVI.

All DVI ports have adapters for HDMI ports.
There are also 2 adapters from Display Port to HDMI ports.
And the monitor that is on the table has an HDMI cable that is connected to the monitor and the other side with a Display Port that is connected to the video card.
And all the monitors that hang on the wall, all 10 have HDMI cables.
[b] The problem is this: [/ b]
I can't make all 11 monitors turn on and show the desktop, I can only do this on 9 monitors, and the remaining 1-2 do not turn on, sometimes they show the driver sometimes not.
I've tried many variations of cable connections on video cards, but I can't connect everything at the same time so that the desktop is visible on them.
Here is the location of all monitors:

Please help me solve this problem.
Computer Configuration:
Operating System: Windows 7 Professional x64
Processor: Indel(R) Core(TM) i7-4770 CPU @ 3.40GHz
Motherboard: Asus Maximus VII Formula
Video card: AMD Radeon R9 270 (3 pieces)
RAM: 16 GB
If you need any more information from me, tell me and I will correct the topic.

Answer 1

in general, amd officially states:
https://youtu.be/Jf0X0lNFmgw?t=68
https://youtu.be/Jf0X0lNFmgw?t=324
https://forums.servethehome.com/index.php?threads/.. linustechtips.com/main/topic/377308-4-displays-1-r
...
https://community.amd.com/message/2686775#2686775
on r9 280x and 290 2 x dvi and 1 x HDMI can work without a dp adapter
, but depending on the video card, it may have a built-in active dp->dvi converter Are
the dp adapters active?
passive dp adapters are not suitable
if active ones - do dp adapters have dp protocol version 1.2 or older?
if the video card has a built-in active dp->hdmi converter:
Have you tried turning off the monitors with the button, restarting the computer and turning on the monitors?
monitors connected to hdmi and dvi are the same?
HDMI source selected in the monitor or auto-select?
Are dvi->hdmi passive adapters?
if the dvi adapters are active (dvi analog to hdmi digital) then they are not suitable.
are you not using eyefinity?
are you using crossfire?
Is the resolution of each monitor greater than 2560 x 1600?
if yes - dvi will not work, max dvi resolution 2560 x 1600
max hdmi resolution 4096 x 2160
how to get around:
you can take an active mst adapter dp-> 3x hdmi, and plug the fourth monitor into the hdmi port on the video card
or active mst adapter dp-> 2x hdmi and two monitors connected to hdmi and dvi
or active mst adapter dp-> 4x hdmi and two monitors connected to hdmi and dvi, and sell the third video card.
Note that if you are using gpgpu it is better to use all three video cards because more video memory will be available this way.
if you are going to use crossfire in games, it is better to change to 2 top-end video cards, because. triple crossfire works worse, besides 270 have low performance and have problems with crossfire at 4k resolutions.
upd, I saw the processor model - it has only 16 pcie lines, respectively, the second and third video cards will be very limited in bandwidth:
2 x PCIe 3.0/2.0 x16 (x16 or dual x8) - when one card is inserted, it works in x16 mode; when two cards are installed, both work in x8 mode, 8 lanes each.
1 x PCIe 2.0 x16 (x4 mode) *1 - when 3 video cards are inserted, they work like this: first x8 second x4 third x4, and the third at the speed of the pcie2 standard - twice as slow.
3 x PCIe 2.0 x1
*1. The PCIe 2.0 x 16 slot (PCIEX4_3) shares bandwidth with SATAExpress_E1 connector. The default setting is in Auto mode that automatically optimizes the system bandwidth. If you install PCIe 2.0 x4 device, the system will automatically detect and disable SATAExpress_E1 connector.
therefore, if you need to run heavy computing applications, or play games, then the third video card will be slow, the second one will also slow down compared to a dual video card configuration. There is almost no gain from triple crossfire if you turn it on.
or change video cards to versions with 6 mini dp ports and connect 6 dp monitors to each, without converters.

Answer 2

Wow, it was probably easier to buy a special controller for video walls or a special board like Matrox Mura MPX-4/4.
And in your case, most likely the problem is in the drivers. Try writing to AMD support.

Answer 3

SyavaSyava
1. I'll try to find something, but I don't think that's the problem
2. yes, I looked and it turns out the number of connected monitors 3.
and now I don't know what to do, everything has already been bought.
but there is one fact. On the first video card, I have 4 monitors connected and all work well.
about the board Matrox Mura MPX-4/4 thanks very interesting thing, I regret that before I bought everything I did not know about it.