cannot get 4 HDMI screens to work on PC

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SilverNodashi

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Hi,

I wonder if anyone can help me with this. We need to setup 8x 50" TV's on 2x PC's. Each PC has an Redeon R7 360 graphics card with 3x TV's connected via HDMI. The 4th TV is connected to the DisplayPort via an "Active Display Port to HDMI" adapter.

Only 3 screens work at a time. If I unplug one of the HDMI connected TV's, the display Port connect TV will work, so it's not a cabling issue. Yet Windows doesn't allow me to display the image on the 4th TV.

Does anyone know how to resolve this? The motherboard only has 1x PIC-e slot.
 
SoftDux-Rudi said:
Hi,

I wonder if anyone can help me with this. We need to setup 8x 50" TV's on 2x PC's. Each PC has an Redeon R7 360 graphics card with 3x TV's connected via HDMI. The 4th TV is connected to the DisplayPort via an "Active Display Port to HDMI" adapter.

Only 3 screens work at a time. If I unplug one of the HDMI connected TV's, the display Port connect TV will work, so it's not a cabling issue. Yet Windows doesn't allow me to display the image on the 4th TV.

Does anyone know how to resolve this? The motherboard only has 1x PIC-e slot.
Click to expand...

Some cards is limited in how many displays it can drive. Check the manufacturer specification sheet.
 
SoftDux-Rudi said:
Hi,

I wonder if anyone can help me with this. We need to setup 8x 50" TV's on 2x PC's. Each PC has an Redeon R7 360 graphics card with 3x TV's connected via HDMI. The 4th TV is connected to the DisplayPort via an "Active Display Port to HDMI" adapter.

Only 3 screens work at a time. If I unplug one of the HDMI connected TV's, the display Port connect TV will work, so it's not a cabling issue. Yet Windows doesn't allow me to display the image on the 4th TV.

Does anyone know how to resolve this? The motherboard only has 1x PIC-e slot.
Click to expand...

I would have suggested SLI. Obviously not an option :o
 
You probably need to plug in 3 screens through the Displayport through an MST adapter, and the last one through HDMI or another connection..
 
Or try other combination with analog output or using passive DP to HDMI adapter.
 
For your information, OP...

TJ99 said:
You probably need to plug in 3 screens through the Displayport through an MST adapter, and the last one through HDMI or another connection..
Click to expand...

TJ99 is correct, or at least correct in one sense. If you have a Displayport MST hub, you can connect three 1920 x 1080 displays at 60Hz using Displayport 1.2a. The fourth monitor can connect up using HDMI.

The way AMD implemented their display engine changed between HD7000 and the newer Radeon 200/300 series of cards. In the past, it was convoluted to figure out how to get three monitors in Eyefinity, but today hooking up multiple monitors is much less hassle.

The way this works now is simple. There are a few scenarios, and in the first two all the monitors are different:

A) One monitor on DP1.2a, one on HDMI 1.4a, one on DVI-I or DVI-D. In this method, all three monitors will work. Adding another one should be done through a MST hub.

B) One monitor on DVI-I, one on DVI-D, and one on DP1.2a. Here this method works, but because you're using both DVI connections, you need to add another monitor through DP. The HDMI port in this scenario is not functional.

The third scenario is a bit different:

C) One monitor on HDMI 1.4a, one on DP1.2a, and two *identical* monitors on the DVI ports.

The identical monitor part is important. The way AMD's display engine functions on cards that aren't Hawaii or Fiji-based is that it shares the pixel clock between the two monitors on DVI, so if you want four monitors, you'll need to have two identical ones on the DVI ports.

You need to either have a MST hub for three of the monitors, and those must be connected using DP-HDMI converters, or you need to have DVI-HDMI converters for two of the monitors.

The DVI-HDMI converters need to be passive and feature the same pin-outs, and they both have to be single-link converters.

Dvi-d_types.svg


Also note: If you're not tied to using Windows, Linux works around this restriction and lets you use all four monitors, which include two legacy connections, HDMI, and DP. I've seen people do this before.
 
Last edited:
CataclysmZA said:
For your information, OP...



TJ99 is correct, or at least correct in one sense. If you have a Displayport MST hub, you can connect three 1920 x 1080 displays at 60Hz using Displayport 1.2a. The fourth monitor can connect up using HDMI.

The way AMD implemented their display engine changed between HD7000 and the newer Radeon 200/300 series of cards. In the past, it was convoluted to figure out how to get three monitors in Eyefinity, but today hooking up multiple monitors is much less hassle.

The way this works now is simple. There are a few scenarios, and in the first two all the monitors are different:

A) One monitor on DP1.2a, one on HDMI 1.4a, one on DVI-I or DVI-D. In this method, all three monitors will work. Adding another one should be done through a MST hub.

B) One monitor on DVI-I, one on DVI-D, and one on DP1.2a. Here this method works, but because you're using both DVI connections, you need to add another monitor through DP. The HDMI port in this scenario is not functional.

The third scenario is a bit different:

C) One monitor on HDMI 1.4a, one on DP1.2a, and two *identical* monitors on the DVI ports.

The identical monitor part is important. The way AMD's display engine functions on cards that aren't Hawaii or Fiji-based is that it shares the pixel clock between the two monitors on DVI, so if you want four monitors, you'll need to have two identical ones on the DVI ports.

You need to either have a MST hub for three of the monitors, and those must be connected using DP-HDMI converters, or you need to have DVI-HDMI converters for two of the monitors.

The DVI-HDMI converters need to be passive and feature the same pin-outs, and they both have to be single-link converters.

Dvi-d_types.svg


Also note: If you're not tied to using Windows, Linux works around this restriction and lets you use all four monitors, which include two legacy connections, HDMI, and DP. I've seen people do this before.
Click to expand...

Ok, so it looks like spending more money and let's ^hope^ it works.

All 4 TV's are identical BTW. Two are connected to DVI through the same DVI to HDMI adapters. One is connected directly through HDMI and then one connected to either the Passive Displayport to HDMI adapter or an Active Displayport to HDMI connecter - but doesn't pickup.

The CCTV monitoring software we use doesn't work on Linux, otherwise I could have gone that route.
 
SoftDux-Rudi said:
All 4 TV's are identical BTW. Two are connected to DVI through the same DVI to HDMI adapters. One is connected directly through HDMI and then one connected to either the Passive Displayport to HDMI adapter or an Active Displayport to HDMI connecter - but doesn't pickup.
Click to expand...

I'd check if the HDMI-DVI adapters you have are single-link. That might be the root cause of the issue.
 
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