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under 9.9.3 i can use both us 4k v2 together! :)May 2014
my actual Setup is one Ultrastudio 4k V2 and one MiniRecorder. They show up both in the system and you can use both on one Thunderbolt port.
I have actual 5-6 Frames latency from Camera to Projector.
I tryed to use two Ultrastudio Cards but i can't use them together. Only one shows up in the BM Control Software... I will try to downgrade to Driver Version 9.xx but i don't think it is a problem from the 10.1 Driver.
i asked BM what they think what the fastest solution is.
they answered me this:
Hi Kai,Thanks for getting in touch.As there are less interface conversions taking place, the UltraStudio 4K would be the most direct solution.We have not cross compared these, and generally speaking, I cannot recommend the use of external Thunderbolt chassis with a PCIe card.I hope this has helped.Regards,Paul WilsonTechnical Support ConsultantBlackmagic Design EMEA
Maybe this helps you a bit.