Bminer in version 15.1.0 can offer an increased hashrate on Cuckaroo29 and Cuckatoo31 algorithms for mining GRIN in the range of 2-5%. Also in this version, the experimental possibility of mining GRIN on AMD video cards was introduced, but only video cards with ROCm support (these are video cards no older than R9 Fury and RX470). ROCm stands for Radeon Open Compute - AMD's own implementation of the OpenCL library. You can download the latest version of the miner on the Bminer.me website.