just wanted to inform you, that I started working on a GPU miner.
At the moment i can't say how long it will take.
Just playing around with eXtremal's (madMAx's) code.
Till now, the results are pretty promising:
On a R9 280 the fermat test gives a 30x - 40x speed increase in comparison to a single cpu core and gmp.
The sieve in Gapcoin only runs about 2-3% of the time,
so at the moment I will only port the primality testing to the GPU.
And of course I will open source it, once it's finished.
Thanks for all your great support so far,
I will keep you informed about the process.
j0nn9