#SAPPHIRE TRIXX FOR R9 390X SERIES#
Sounds like AMD did indeed re-use most all their 200 series cores on the 300 series cards. Depending on your cases cooling you will need to tweak it a bit for good cooling and acceptable noise levels.
#SAPPHIRE TRIXX FOR R9 390X SOFTWARE#
I recommend installing Sapphires Trixx software which can be used to create a custom profile for fan settings. It barely goes above 50 in Far Cry 3, raising the temperature to 85 C.