Careful with this version, while people report no major power increase, if you ever watched the gpu power consumption in gpu-z, you will see that each card has a power spike when it finishes a share (or something in the same ballpark). If you take the avg power consumption, it might look ok for the PSU, but those spikes, if they are done at the same time on most or all GPUs, even a relatively good PSU will make the system freeze or even shutdown. Happened on 2 systems of mine after switching to V9. I have pretty poor power supplies, a seasonic 750w (it can get to 830-840w without shuting down) and a segotep 800w (at 50 degrees, 900w at 25 degrees). The first one has 5x 470s, and the 2nd one has 2x470 and a 290x and a 390. I undervolt the shit out of every card so that systems are stable 24/7. Now with v9 I had to undervolt more and also underclock (at least on the core) to make systems not freeze (I didn't get any bsods or restarts, or artifacts, only screen turned black and no signal from card, but systems kept running, so cards are not the issue).
So careful with what PSU you choose, in my opinion, a 1000w is the minimum for a 5x470/480 if you plan to leave stock or overclock a bit. For 6 cards you will need 1150-1200w psu.
The other option is to undervolt, like I did, and you could also lower power limit in AB for each card, maybe that helps with power spikes (I will experiment with that).

In conclusion, while on avg power consumption the eth miner is higher, those power spikes on zcash miner are overloading our psu's if done simultaneously on more cards or all. My sistems were completely stable at the same settings used in clay v8 on eth miner, so not the avg power consumption is the issue, clearly.

There is even a separate thread created by someone having these issues, and some others are joining in saying they have the same issue, but didn't bother into actually checking why it happens. It is not the miner's fault!