I still haven't found a link to source that new hardware is not needed. I'm on 9.2 and will pull the trigger if I can get a source to people saying the team announced it wouldn't require new hardware.
Its never safe without a condom.
IIRC there's definitely a new 9.x-ready firmware with the new cards, (I believe they said that all orders shipped after their announcement will have it), but as of now it's definitely a good idea to get one. Although if you want to you can just wait and see, and then order.