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The Definitive Ethereum Mining Performance Article

By: Anthony Garreffa | AMD Radeon GPU in Video Cards | Posted: Sep 14, 2017 4:09 pm

AMD Radeon RX Vega 64 Air-Cooled


The big difference for Ethereum mining performance between the Radeon RX Vega 56 and RX Vega 64 is the clock speed of the 8GB of HBM2, with AMD clocking it at 800MHz on the RX Vega 56 while the RX Vega 64's 8GB of HBM2 is clocked at 945MHz.




Even the air-cooled version of Radeon RX Vega 64 can have its HBM2 clocked up to 1100MHz, resulting in a huge 38MH/s at less than 380W of power. But because it's the air-cooled variant, anything above 70C and the HBM2 clock starts sagging down to 800MHz, resulting in radically reduced ETH mining performance. On the other hand, the RX Vega 64 LCE can have its fan speed tweaked to keep the temps under 60C without a problem, thanks to its massive water cooler.



Once the fans spin above 3000RPM, the RX Vega 64 air-cooled can sustain sub 70C temperatures and above 38MH/s, beating out the GeForce GTX 1080 Ti that it sits in the machine next to.



AMD Radeon RX Vega 64 Liquid Cooled Edition


This is where the fun really begins, but RX Vega 64 isn't as much fun as RX Vega 56 because it costs $100 more and is really limited by thermals. AMD has the 8GB of HBM2 clocked at 1000MHz on the RX Vega 64 and RX Vega 64 LCE, but both of my samples could be clocked to 1140MHz, without a problem, but anything over 1150MHz resulted in crashing.




Out of the box performance in ETH mining on the new AMD Radeon RX Vega 64 air-cooled variant reached 33.4MH/s, but after a few minutes, the temperatures spiked at 76C, which see the card coming back down to somewhere in the vicinity of 31.5MH/s and 34MH/s.


But this is where the fun began. AMD was a large part of my two 15-hour days of Ethereum mining performance testing on just four graphics cards. Once the Radeon RX Vega 64 air-cooled card reached 76C, the HBM2 clocks were fluctuating as the card was flooded with heat. I had a few options: cranking the fans up (which I did) and increasing the power limit (which I also did).




Once I increased the power limit up to 30%, the power consumption on the entire system reached a dizzying 400W, much higher than what I had been reading online from other tech media. Once the power limit was increased to 30%, the Ethereum mining performance reached an insane 42.7MH/s max, while it did drop to 39.5MH/s.


With the power limit increased to +20%, the power consumption reached the same 400W, while mining performance dropped to 39.2MH/s... but remember, I haven't overclocked the 8GB of HBM2 just yet.

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