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Ethereum: R9 390 faster than 1070?!

CostcoSamples
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I have two gaming rigs, one with GTX 1070 and one with R9 390.  I decided to put them both to work on Ethereum mining.  My 1070 gets about 26Mh/s and my 390 gets 29Mh/s.  This was rather shocking to me!  I can see why AMD cards are so popular among miners.  For fun, I put my laptop to work as well (GTX 970m) and it gets about 1 to 2 Mh/s.  

 

Is this normal?

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Don't forget about power cost. A 390 sucks a lot of juice compared to a 1070. 

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2 minutes ago, DrMacintosh said:

Don't forget about power cost. A 390 sucks a lot of juice compared to a 1070. 

Yes, good point.  At least power here is relatively cheap.  

i7 4790k @4.7 | GTX 1070 Strix | Z97 Sabertooth | 32GB  DDR3 2400 mhz | Intel 750 SSD | Define R5 | Corsair K70 | Steel Series Rival | XB271, 1440p, IPS, 165hz | 5.1 Surround
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3 minutes ago, CostcoSamples said:

Yes, good point.  At least power here is relatively cheap.  

I don't know what part of Alberta you live in where you'd consider power to be cheap :P

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You can get up to 31Mh/s with the 1070 when overclocked.

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