GPU miner is going to be released soon. Check slack
The miner that will be released "soon" will ONLY embody Nvidia cards as it is written in CUDA. It will also be locked onto a single pool with a fee as well. My release is written in OpenCL and can mine on both AMD and Nvidia, and even my OpenCL Nvidia implementation has a bit higher hashrate than his.
Maybe yours is better but 5 BTC is a lot of money. If you didn't saw BTC = 7000$ so 35k % for your miner is too much. You'll buy a lot of BIS with 5 BTC. Good luck!