Add to Cart DeckLink 4K Extreme 12G - Quad SDI Option Blackmagic Design MSRP: Now: $134.20 inc GST Was: The Decklink Quad 3G-SDI Mezzanine Card for Decklink 4K Extreme 12G is a replacement for the original daughter card that came with your Decklink 4K Extreme 12G...