My mind has been blown away by how good this card is, i owned a R9 290x prior and thought that was good.
I have noticed 0 coil whine, something i hated about my 290x, its quiet and runs much much cooler, in 3dmark i got 16500 oc the titan 200/400 and it topped out at 72c using custom profiles for the fan, my 290x 3dmark was just over 9300 but sounded like a 747 taking off and released more heat than the sun.
Debated on buying a second but i honestly don't see the need atm.
Just like to add this forum is fantastic for people like me who are fairly new to all things pc.
Regards