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More like ~39 MH/s at 170W is the benchmarks I've seen. The original $400 price is a fantasy at this point. If you could get RX 570's for their original price, with two you would get ~56 MH/s for less than $400.
- Exactly. Again, Rig of 13 RX570 gives 390MH and cost of 1 card is 310USD as of today. $4000 per all GPU.
Rig of 10 P104-100 gives 400MH and cost of 1 cards is $700USD as of today. $7000 per all GPU.
To make it en par cost of P104-100 must be $400 delivered in USA. Which never was the case.
Power consumption difference. RIG of 13 RX570 = 1000Wt, RIG of 10 P104 = 1500Wt.
So even with theoretical price decrease, you still pay 50% more for electricity.
And, finally, there is no resale value and 3 month warranty.