I know these cards are relatively new to the scene so there isn't much information about them. The hardware comparison wiki is incomplete and for some reason won't allow me to add my card... anyways.

I'm currently using An XFX r9 280x DD and getting a steady 716kh/s  i've managed to go a bit higher but am uncomfortable with the resulting temps, and most of us know how xfx likes to skimp on the vrm cooling. 

I'm using Cgminer 3.5  with the following batch file,

cgminer.exe --scrypt -o stratum+tcp://miningpoolurl:3333 -u yourusername -p yourpassword -I 13 -g 2 -w 256 --thread-concurrency 8192 --gpu-powertune 20


This works for me for now, i might throw in another one eventually and come up with a better way to cool them.

currently sitting steady at 72c.   

I'd be curious to see other peoples settings and hear any recommendations about mine..