it's still profitable to buy Z9 or A9 ?
i have almost free electricity (0.02-0.03$ per kwh)
is it possible to achieve Payback under 4 month?
any advice?
Returns have halved every ~2-3 weeks. equihash is quickly heading towards "don't mine it", in my opinion.
Z9s still haven't shipped also.
-j
I do not think that they halved every 2-3 weeks. I started mining on one Z9 mini around June 27 and was getting ~ 0.15 ZEC/day. Now, I am getting ~0.085 ZEC/day (I am only running at 675 MHz). In other words, it did not even halved for me yet (after 2.5 months).
Look at the difficulty chart
https://www.coinwarz.com/difficulty-charts/zcash-difficulty-chartI do not see any of the dramatic drops, you are talking about. You understand that we earn less in $ because Crypto dropped a lot. What are you mining now with your GPUs? Perhaps not ETH (LOL)