A couple of days a go i sold my 6x 370s and bought 3x Sapphire Nitro+ RX 470 4GB OC instead and was the best decision because i got higher hashing speed with lower watt, from 750w to 400w.
I guess now most of new and old miners know that the RX 470s 4GB are the most efficient cards to mine with, at least for Ethereum, ZCash, Monero, PascalCoin etc..
In this tutorial i am going to show you how to modify and flashBIOS to your RX 470s, this will increase the GPU hashrate substantially. My RX 470s went from 22.xx Mh/s at stock settings to 24.xx with modded bios and 29.xx with overclock and undervolt. So i got a much higher hashrate and at the same time low watt consumption with better hashing speed, around 70w to 80w per card.
The thing is that not all cards are the same, for example there are 4 different types of memory #1 Hynix (31.xx Mh/s), #1 Elpida (31.xx Mh/s), #2 Samsung (28.xx Mh/s), #3 Micron (22-24.xx Mh/s), read more about the memory types and how to spot them here. I wasn’t that lucky to get a Hynix or Elpida but i got a Samsung instead, which is better than Micron :), after few days of struggling and testing i was able to get a nice and decent hashing speed of 29.xx Mh/s on Ethereum, most of miners are reporting 28.xx Mh/s maximum hashrate but for some reason i was able to push the cards a bit more.
Right now i am going to share with you my BIOS mod for Sapphire Nitro+ RX 470 4GB OC, specially with Samsung memory but i will include in the tutorial how to mod and flash the cards with Hynix, Elpida, Micron also two Reference models. Also ill show you what driver version, software and tools are needed to flash and modify bios.
To make the things even clear this is the exact card i am using in this tutorial: