I finally received 2 Sapphire Nitro RX470 8GB today, I am disappointed they put the artificial memory limit at 2100MHz max. Only bought 2 luckily.
Test with 1 card on pci-e slot 1 x16.
Sapphire RX470 8GB, 16.8.1, 75.9% asic, mem at 2100MHz in Wattman.
idle: 92W
mining at 1025/2100, 900mv 25.5MH/s: 207W
at 875mv, 202W
at 850mv, rejected shares
87.3% asic
At 1025/2100 875mv, 202W still mining but screen doesn't wake up
With both card mining, took 328W, so 125W per card on Corsair AX750.
Then I pick the 75.4% asic Ref RX480 8GB, 16.8.1
idle: 90.5W
1025/2100, 875mv, 200W
Basically, 2-3W statistical noise difference vs Nitro RX470 8GB.
This ref 8GB card needs 900-912mv to be stable. To show the mini-throttling when not enough vcore is applied,
At 875mv, 25-25.2Mh/s
At 888mv, 25.2-25.4 Mh/s
At 900mv, 25.5 Mh/s is reachable.
Test with 1 card on pci-e slot 1 x16.
Sapphire RX470 8GB, 16.8.1, 75.9% asic, mem at 2100MHz in Wattman.
idle: 92W
mining at 1025/2100, 900mv 25.5MH/s: 207W
at 875mv, 202W
at 850mv, rejected shares
87.3% asic
At 1025/2100 875mv, 202W still mining but screen doesn't wake up
With both card mining, took 328W, so 125W per card on Corsair AX750.
Then I pick the 75.4% asic Ref RX480 8GB, 16.8.1
idle: 90.5W
1025/2100, 875mv, 200W
Basically, 2-3W statistical noise difference vs Nitro RX470 8GB.
This ref 8GB card needs 900-912mv to be stable. To show the mini-throttling when not enough vcore is applied,
At 875mv, 25-25.2Mh/s
At 888mv, 25.2-25.4 Mh/s
At 900mv, 25.5 Mh/s is reachable.