04-08-2016, 05:23 PM
You don't need OpenCL & CUDA in parallel to use both GPUs cooperatively, you just need to grab the latest oclHashcat beta or build from master. We dropped CUDA entirely, so now we use OpenCL on all devices (AMD, Nvidia, Intel, CPU, etc.)
By adding a GTX 970 your speed will be just slightly over double. Should get about 340 KH/s combined.
By adding a GTX 970 your speed will be just slightly over double. Should get about 340 KH/s combined.