Hi there,
i've managed to build a experimental gpu miner.
It got me about 200,000 pps with one R9 280x without any overclocking or powertune.
Currently the miner is very experimental and needs to be tested,
therefore I published the source code on github.
The miner is a hybrid version of eXtremals fermat test and GapMiners sieve.
The sieving is calculated on the cpu and the fermat tests are running on the GPU.
Currently it is very (host) memory hungry about 1GB and you have to use one instance
per gpu device.
You can get it with:
git clone https://github.com/gapcoin/GapMiner.git -b gpu-miner
cd GapMiner
git submodule init
git submodule update
It was built against amd app sdk v2.9 but maybe works with other versions too.
You can edit the Makefile to change the sdk destination directory.
I will merge nonce-pools stratum changes, and probably fix some bugs
at the weekend, and then create some binaries within the next week.