I've got a 6xRX470 4GB Nitro rig and both 9.7 and 9.6 have been running stable for me other the last days (switched from zec last week).
Using 16.11.1 drivers.
However i encoutered problems using the tuning options (-cvddc  -cclock  ...). I'm now using wattool and everything is fine (hashing @ around 4440 h, not fully optimized yet)