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AJA Video I/O Card Installation
Before you begin, make sure that you check the Video I/O Board section of the Legacy HPZ4G4 Configuration.
Supported Slot Order & Configuration with Reality Engine
Slot
Electrical
Mechanical
Card
1
x16 PCIe Gen 3
x16
GPU
2
x4 PCIe Gen 3
x4
-
3
x16 PCIe Gen 3
x16
Video I/O card (Secondary Optional)
4
x4 PCIe Gen 3
x4
-
5
x8 PCIe Gen 3
x8
Video I/O card (Primary)

Installation of AJA Video I/O card on PCIe Slot

AJA Video I/O card has 8-Lane PCIe construction. Hence you have to install it on PCIe slot 5.
The below image shows the motherboard marked with Slot 1 (for GPU), Slot 3 (for secondary optional video I/O), and Slot 5 (for primary video I/O).
You can install a secondary Video I/O card on Slot 3.
On the HP Z4 G4, the 8-Lane slot is positioned far from Slot 1, where GPU will be installed, so it ensures sufficient cooling and airflow.
Installing a Video I/O card on Slot 3 is not preferred as the GPU installed on Slot 1 may generate heat, and as both the cards will be closer to each other, there will not be enough gap between both the boards.

Video I/O installed on Slot 5

After installing video I/O as described above, make sure to lock the PCIe bracket securely, which holds the PCIe card on the motherboard firmly.
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Installation of AJA Video I/O card on PCIe Slot
Video I/O installed on Slot 5