OK, done some testing got to know my card a bit.
My old card was a windforce (3 fan) 760 so I'll be comparing against that.
This is my first time using an AMD card too.
First off, build quality is amazing and the LEDs are really nice. (How do I configure them?)
I have a 144Hz monitor which needs DVI hence my choice of card. I install the necessary drivers and reboot. Adjust resolution and make sure refresh rate is set to 144Hz. And then my screen flashed with gray and black lines for a split second.
I was excited and so didn't uninstall my Nvidia drivers so I use DDU to wipe everything and reinstall AMD drivers. Screen still flashes :/
Quick google later I find "Reduce DVI frequency on high res displays" and "Alternate DVI operational mode" which promise to help against distortion etc and turn them both on. Whilst this seems to have greatly reduced the occurrence of the flashing it does still happen randomly and rarely.
Before I get to performance I'd like to talk about noise, my 760 was pretty quiet normally but pretty obnoxious if I left my case cover on (fractal core 500) for an extended time whilst gaming. The Nitro is silent at idle due to the fans stopping with an idle temp of about 41°C from boot. During my benchmarking WattMan said the fans got up to around 2200 RPM which was loud and a temp of 70°C. The fans stop once the card gets to 47°C.
Now for performance numbers. Only tested two benchmarks ATM.
Unigene Heaven- Extreme with 1080p fullscreen = Score 1371
Firestrike: Graphics score 13,467
http://www.3dmark.com/3dm/13674134?