vMix :Talking about PCIe and why it's important for capture cards. 

Mine works great on both a laptop and a desktop

Hi Christoffer, I just went through this. Thunderbolt 3/4 only supports 4 lanes of PCIe. So, you won't get 40 g's through it, unless you use cards that are PCIe Gen 2 or higher. that only use 4 lanes. And you have to be careful not to accidentally get a card that does support the resolution and FPS that you need. If your card is Gen 1, like the Black Magic Quad Recorder, it's an 8 lane, so you'll only get 22 g's per sec. I checked that number with Sonnet and they said it was true. Note: They warn about that in their website. I'm sure somethings might go at the intended speed. Elgato's 4K HDMI Pro quad, is 4-lane and it's PCIe Gen 2.0. But, it can't do 4K 60 fps. It can only do 4K 30. But, with the combo of my Mac Mini MI 16gb, and a correctly specked Sonnet, I ran into awful lag problems with the Black Magic. I went to the MAC store and they were like, 6 cameras?, Get a PC. So, I went to my 9 year old PC, plugged my Decklink Quad Recorder directly into one of the PCIe slots, and my problems dissapeared--at least at the 1080 30 setting that my cameras were on and failing at on the Mac. (I'm running 6 cams. So, I want to add another card. Plus, I want to record 4K 60 with vMix with all 6 cams if possible, with automated overlays, etc. So, I think I'm going to get forced into one of these 3 PCIe slot motherboards. Like the ASUS Pro Art. It has the most PCIe, thunderbolt 4, and USB 3.2 IO of any Asus, except one or more of the Asus pro's. And the Pro board with the most slots that I'm remembering from earlier today, costs over 5K. I started trying to solve these issues with no experience starting in November. It's resulted in me migrating back to windows, and also stopping my video production while I solve this. It's been an education, I wish someone would have hipped me up to what was hurtling toward me. There are companies that make breakaway boxes that use Fiber. But the cards are over a grand. And the breakout sisterboards, that are actually very big, cost thousands. But, they look like the future to me for sure. Unless motherboards start showing up with PCIe slots, again. Frustrating. I might have to use one 4 way HDMI, and one Elgato CamLink 4K (30 fps), and my last camera using straight USB. BEST OF LUCK. Let me know if you hit UREKA so I can steal your solution(s). :) Lots of Laughs & Learning --Ned

have you found a solution? I'm looking for the same setup, 2 BMD capture cards (one HDMI, one SDI), 8 PCIe lanes each...

That's a tough one. I think Britney, although it's a close call. Her era with the Neptunes production puts her over the edge for me.

obs

We have Reference Systems on our website you could give to a PC builder-www.vmix.com/products/vmix-reference-systems.aspx Or you could contact one of the Resellers on our website- www.vmix.com/Purchase/Resellers.aspx?Product=Custom+Systems