Ok so a couple things

When I increase the gpu mining intensity to 4 the miner stops working. i'm only getting like 5/hs @ 2 intensity instead of 10ish from 4. Whats up with that? Shouldn't the intensity go higher than 4? I should be able to get better hashing rate @ 4 intensity but it stops mining every time i try to increase the intensity.

Also why does my cpu miner produce more h/s than my gpu for BCN. Shouldn't it be the other way around?

And is there any possibility of adding zcash?