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Question about Decklink 8K Pro

PostPosted: Fri Jun 21, 2019 5:07 am
by Sandman
There seems to be a 6-pin power connector on the back, but I can't find any documentation explaining if it always requires that to be plugged in. The tech specs page says the card draws 19 watts, which is well within the spec to be powered by the PCIe slot alone. Is there a certain threshold of bandwidth (for example, three inputs receiving 4K60, or all four) or other situation in which the power connector is required?

I'm curious because I'm running a mobile recording/streaming rig using a Thunderbolt 3 enclosure (currently a Sonnet Echo Express SE-I, but will be upgrading to an SE-III, neither of which have internal power connectors) and a Decklink Duo 2. If I'm able to use the 8K Pro with a couple of 4K30 inputs (and possibly one or two 1080p60 outputs) without needing the power connector, I'll upgrade to that, but if not, I'll just get a second Decklink Duo 2 when I upgrade my TB3 enclosure

Re: Question about Decklink 8K Pro

PostPosted: Wed Jun 26, 2019 1:32 am
by Dave Del Vecchio
It's a little unclear why the 6-pin auxiliary power connector is needed if the DeckLink 8K Pro card draws less than 25W, but I think you can probably get by without it.

I have used the DeckLink 4K Extreme 12G card without the 6-pin aux power connector without any problems in both regular motherboards and PCIe expansion enclosures (that card draws up to 30W, so the secondary power connector makes some sense there).

Keep in mind that the DeckLink 8K Pro requires a PCIe 3.0 slot though, so I'm not sure it will work with the Sonnet Echo Express SE-I (which only has a PCIe 2.0 slot). I think it should work with the Echo Express SE-III though. That enclosure has a 120W power supply, so it should be enough for the 8K Pro card, provided that you don't have a bunch of other power hungry cards installed in the same enclosure.