My whole machine with 2x Vega 64 draws 270W from the wall and does 2050h/s XMR. I only downclock core to 1080, overclock mem to 1100 and set temp target to 70.
Voltage is auto. At $499 they are pretty good value (as a 1080ti user). You will get faster ROI using 570 and 580s now, but I think we need to wait for bios mod tools to unlock vega's potential.
could you share your power draw in some pics? do u use any kind of kill-a-watt?
270 for 2 vega 64 + whole system I think it's not possible.....
Yes kill-a-watt. here's a pic of the rig
https://imgur.com/GXffFNi
and gpuz/hash rate screenshot.
https://imgur.com/dodWOgk
1.5x the XMR hash rate of 580s, same power draw. Godlike efficiency
It can be dropped to 250W, 1980h/s too. Regular 17.8.2 driver. BC driver crashes on my cards instantly when trying to mine eth.
Even though the price of XMR more than doubled during the past two to three weeks, the profitability of mining XMR is still about 75% of mining ETH by using the same hardware...
so I don't see too much efficiency gain of Vega comparing to RX 580 or GTX 1070...
of course, if you have free or very low electricity, and can buy Vega at MSRP, that's another story