In this tutorial i am going to show you how to modify and flash BIOS 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:


1.Download and install/extract the following

2.Save original Default BIOS

  • Shut down your rig
  • Remove all the GPUs and leave only one plugged, my recommendation is to flash the cards one by one
  • Start the rig and Extract ATIFlash 2.74 to C: in a folder like “atiflash
  • Run ATIWinflash.exe as administrator, click on “Save” button to save the default BIOS (make sure the RX 470 card is selected), give it a name like Sapphire470defaultBIOS.rom
  • Click “ok” and “continue
  • Once the BIOS is saved close ATIFlash

3.Silent BIOS Switch

  • Shutdown your rig again
  • Switch BIOS to silent mode (towards the HDMI cable side)
  • Start the rig

4.Save original Silent BIOS

  • Open ATIWinflash.exe as administrator
  • Save the BIOS again, this time give it a name like Sapphire470silentBIOS.rom

5.Modifying / Modding the BIOS

  • Start GPU-Z to find out what type of memory does your GPU have, make sure you use the correct ROM to flash the card
  • Start Polaris Bios Editor
  • Open Sapphire470silentBIOS.rom
  • On TIMING (MHz) area copy 1750 timings to 1900 and 2000, or you can try to copy from 1625 to 1750, 1900 and 2000
  • Save the modded BIOS like Sapphire47modded.rom
  • Close Polaris Bios Editor

Download 1625 timings!E84W3YDb!rPxXD-m__3ISunSU6WvgiXw6xNhYgy3hZ1Oj40YCg6s

Download 1750 timings

Hynix Memory
  • Start Polaris Bios Editor
  • Open Sapphire470silentBIOS.rom
  • On TIMING (MHz) area copy 1500 to 1625, 1750 and 2000
  • Save the modded BIOS like Sapphire47moddedHynix.rom
  • Close Polaris Bios Editor


Elpida Memory
Reference: Hynix Memory
Reference: Micron Memory

6.Flash the BIOS with ATIFlash 2.74

  • Start ATIFlash 2.74
  • Load the image Sapphire470modded.rom
  • Click on “Program” button
  • Wait about 30-60 seconds till you get the message “Your VBIOS was programmed successfully“, click OK
  • Restart the rig and test

Pretty much this is it, repeat the same steps with each GPU.

Here is the same GPU before and after bios mod

6 Overclock and Undervolt for low watt usage

  • Start Sapphire Trixx
  • GPU Clock: 1150
  • Memory Clock: 2050 (you can start from 2000 and increase, i can go up to 2050, 2070. The 2100 is not that stable)
  • mV: -100
  • Apply modifications

My results:

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