All About BTC, LTC, ETH mining as well as other alternative crypto currencies
When the new sgminer 5 develop version was updated to include the latest Neoscrypt OpenCL kernel from Wolf9466 a few days ago it has turned out that the latest performance optimizations do break compatibility with Nvidia cards as well as with the latest AMD video drivers. The solution was to use older AMD Radeon drivers to generate the kernel binary and them get back to the latest, but now there is an even easier workaround that was discovered by an user called insanid from the Feathercoin forum that does not require you to instal different drivers. All you have to do is to include the OpenCL libraries from an older driver such as 14.6 or 14.7 in the folder of the sgminer and the miner will generate properly the kernel binary file. Then you can either run sgminer for Neoscrypt with these DLL files in the folder or remove them and use the ones installed by the latest video drivers such as 14.9. To make it easier for you we have included the OpenCL DLL libraries in our windows binary compilation of the latest sgminer 5 development branch (source) and you can download the full package from the link below and try this workaround yourself.
The newest development version of sgminer 5 (source) now includes an updated kernel for the Neoscrypt crypto algorithm by Wolf9466 that increases the hashrate significantly from the previous release. There is a catch however, the new kernel does not work anymore on Nvidia GPUs, you need to use the previus release for these. Also it seems that the latest kernel optimizations break support for the latest 14.9 AMD drivers, at least on Windows, so you need to use an older driver version (14.6 or 14.7 for example) to generate the kernel binary and then update again to the latest driver for the maximum performance (much like with the older cgminer 3.7.7 fork with Neoscrypt). The new OpenCL kernel is designed to be used with Worksize of 64 for optimum performance and with it you should be able to achieve hashrate of up to about 200-250 KHS or even more with Radeon R9 280X GPU or up to abut 250-300 KHS for Radeon R9 290/290X. We have compiled a windows binary that includes the latest optimized kernel that you can download and try from the link below, if you try it out feel free to share your results from using it.
The latest development version of sgminer 5 (source) now also includes support for the Neoscrypt crypto algorithm for mining FTC and other crypto currencies relying on it. The OpenCL kernel included is the optimized version also available in the cgminer 3.7.8 with Neoscrypt that offers better performance and supports the latest AMD drivers version 14.9 (thanks to Wolf9466 Neoscrypt kernel improvements). We have compiled a windows binary and you can download it below to try it out, however it seems that the performance we get with this version of sgminer is a bit lower than with the dedicated fork of cgminer 3.7.8 on AMD Radeon R9 280X, the performance on Nvidia GPUs is the same. There is still no CUDA miner for Nvidia GPUS with Neoscrypt support, so if you want to mine Feathercoin with Nvidia-based GPUS such as GTX 750 or GTX 970/980 you need to use one of the OpenCL miners.