I look at their source. The ones I actually tried appear to have only been implemented as far as required to crack the author's own archives, then were posted

I look at their source. The ones I actually tried appear to have only been implemented as far as required to crack the author's own archives, then were posted as-is. I'll have a look at ocl-hashcat, I had not heard of that one. On my macbook pro, I have a core quad xeon, which has hyperthreading, so sorta kind 8 CPUs, and two GPUs. I don't recall whether one is amd or if they're both nvidia. I do know that apple made some macs that had both vendors' gpus.