Creating a 2×4 Video Wall

Using Two 2×2 Daisy-Chained Groups + GPU Mosaic

When using DisplayPort daisy-chain mode, each group of TILE units is detected by the Operating System as one single display.

This allows you to bypass GPU output limitations and build larger video walls efficiently.

In this example, we will configure a 2×4 video wall (8 TILE units) using:

• Two independent 2×2 daisy-chained groups

• Internal videowall processing per group

• GPU Mosaic to merge both groups

Concept Overview

You will create:

• Group A → 2×2 TILE units

• Group B → 2×2 TILE units

Each group:

• Is daisy-chained via DisplayPort

• Is daisy-chained via RS232 (not necessary to create to groups all units can be daisy-chained)

• Is merged internally using Screen Control Software

• Is detected by the OS as one 3840×2160 display

Then:

• Both 3840×2160 groups are merged via GPU Mosaic

• Final canvas resolution becomes:

7680 × 2160

Step 1 – Create Two 2×2 Daisy-Chained Groups

Per Group:

1. Daisy-chain 4 TILE units via DisplayPort

2. Daisy-chain the same 4 units via RS232

3. Open Screen Control Software

4. Configure matrix as:

   2 rows × 4 columns
   

5. Complete ID mapping

6. Merge by group

After merging, each group outputs:

1920× 1080 

Now is necessary to set the resolution of each gorup to 3840x2160 on the GPU
      Note: Depending on the number of Tiles and orientation custom resolutions might need to be created.

Step 2 – GPU Configuration

Once both groups are merged internally:

• The OS detects 2 displays

  • Display 1 → 3840×2160

  • Display 2 → 3840×2160

Now:

1. Open your GPU Control Panel (NVIDIA Mosaic example)

2. Select both displays

3. Choose layout:

   1 row × 2 columns
   

4. Apply Mosaic

Final Result

The GPU merges both 4K groups into one large canvas:

7680 × 2160

You now have:

• 8 physical TILE units

• 2 internal merged groups

• 1 final unified display detected by the OS

Why This Method Is Efficient

• Each daisy-chain group stays within the 4K limit

• GPU only handles 2 displays instead of 8

• You bypass typical 4-output GPU limitations

• Configuration remains stable and scalable

Important Notes

• Each daisy-chain group cannot exceed 3840×2160

• RS232 mapping must be completed before GPU Mosaic

• Refresh rate should remain consistent (60Hz recommended)

• Use certified DisplayPort cables

Resolution Breakdown