I have 2 xfx rx 560 at the moment.
One I bought a few months ago and just got another from my brother who upgraded to gtx 1060
So how do I crossfire? And do I need to buy anything else?
Motherboard - Asus 8th gen z370
Power supply 450watt
This is a rough guide for PSU requirements in multi-gpu scenarios: http://www.realhardtechx.com/index_archivos/Page362.htm
As far as bridges not being used I don't think AMD has used them in 5 years or so? From memory the 280(x) was one of the last cards to use it?