They've been adding a lot of support for the AMD cards recently, and even working on getting hardware acceleration for encoding/decoding H.264 working for both Nvidia and AMD cards. There's still a small advantage to using Nvidia cards, but it's certainly less than it was.
I don't know about that specific card. If RJL pops in, I'm sure he could give the complete technical data.
It does not work. Just had a PC built with this card. Crashes Premiere Pro consistently and within minutes of running. The computer freezes and only a hard reboot will get it going again. Looking for any setting change solutions to fix but so far nothing