My reasoning is even with 35-45 for a gpu the i5 6400t does 20h
the 19.9h below cost me 35 watts . so far cpu mining on zcash is not terrible compared to gpu mining.
Phil you have to think about Dual CPU MB and two Intel 2011-v3 CPUs (20 cores in total)

I have dual e5 2670 xeons 32 cores total. Only hitting around25-30 sol
Which generation? I think the v3 has AVX2, which should help.
I was looking into a xeon phi (1st gen) that has 61 cores @ 1.1 GHz. It unfortunately does NOT have AVX support, so I don't think it would ultimately be good for zcash mining. I decided against it. Bit of an unknown, also, whether I could get a miner to run on the embedded Linux host.