I'm getting steady 30MH/s on each Fury X on stock clocks (1050/500). Claymore's can only get about 28MH.
A 390 at 1040Mhz gets 29Mh, with some overclocking I can surely can 32-33MH, but my cards warm up too much. Definitely the best miner out there.
The only issue I can spot is the CPU usage, which makes this miner basically worthless on weak CPUs. I couldn't run it on a single-core AMD CPU and a friend of mine had his rig crashing with a dual core Celeron installed. most mining rigs have very weak CPUs, and if this miner gets updated to support them, I am sure it will get much more traction.
What is the configuration of your R9 Fury?
I included it in the post - 1050/500. stock clocks, didn't change anything.
What is your sgminer setting? For example, gpu threads, work size or the intensity values. do you have lots of hard ware error?
"gpu-powertune": "0",
"worksize": "192",
"name": "eth",
"algorithm": "ethash",
"gpu-threads": "1",
"xintensity": "1024"
Those are the settings, the intensity doesn't change much on both 512 and 256. 30Mh/s on stock clocks, no errors whatsoever.
I have R9 nano cards, with xintensity of 256 and work size of 64. there are tons of HW.