If you need more than one HDMI or SDI input, it is recommended to use an external Thunderbolt PCIe Expander box and one or more Blackmagic PCI cards.
Thunderbolt PCIe Expander Boxes:
- Sonnettech PCIe Card Expansion Systems (Various desktop enclosures with 1 to 3 slots, 19 inch Rack mount version)
- OWC Mercury Helios (1 Slot desktop)
Blackmagic Design Cards:
- 4 HDMI inputs – Blackmagic Design DeckLink Quad HDMI Recorder
- 4 SDI in-/outputs – Blackmagic Design DeckLink Duo 2
- 8 SDI in-/outputs – Blackmagic Design DeckLink Quad 2 (Note: This card features mini SDI connectors that need adapters and are more delicate)
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