Wow! I did not know that. Thanks for the heads up on the web driver issue. Maybe you can give me your opinion regarding a Sierra Upgrade on my MP 5,1. So far everything works really great for me on El Capitan. My card however is a flashed version with a working Apple logo on startup. I run my HTC Vive from bootcamp on Win7. In case I would upgrade to the new Sierra MacOS, do you think I will encounter some trouble? Could an upgrade to Sierra screw up my Win7 bootcamp partition ?(I hope not, otherwise I just keep everything on El Capitan - plus I am not sure if HP will issue a new driver for my first version HP envy printer..)
Cheers
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A nice overview regarding performance compared to other options may give you this article here:
http://barefeats.com/sierra_rx480.html
I haven't encountered any issue with Sierra. There are some Wifi cards that shipped with the 4,1 that don't work.
Just keep a drive with El Capitan until you are sure you can migrate to the new OS after thorough testing.