MacPro 4,1/5,1 video cards and audio support

I have a MacPro5,1 2010 model and I am considering replacing the standard video card with a newer more powerful one which can support 4K displays. I have however seen a lot of reports of problems with Yosemite 10.10.2 and being unable to send audio via the Mini Displayport or HDMI ports on various replacement video cards.
I was wondering if anyone here had better news to report regarding this issue. If so what configuration is working for you?
Am I also right in thinking that all third-party cards regardless of inherent capabilities would be unable to do Displayport MST, and 4K 60Hz via HDMI in OS X?
PS. I would ideally want to retain the Mac boot screen on such a card. (PC flashed cards do not support this.)

The hatter wrote:
Ask MACVIDCARDS
I have already sent them an email and I am awaiting a reply but they will only be able to speak regarding the particular models of card they deal with, there maybe other models they don't handle that have better results - at least with regards to my list of requirements.

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