If you backup your original working BIOS, you shouldn't have a problem with bricking the device, as you can simply restore it. Also, keeping an extra card around with an unmodded BOIS so that you have something to restore your BIOS's with, because a bricked device will just result in a black screen. The RX 470 seems to be fully functional with OpenGL - which the RX 480 struggles in macOS. I was able to run Valley and Heaven for more than an hour without issues. This is a huge improvement over the RX 480 which crashes out within seconds.
Posted by3 years ago
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No doubt people will be wondering how this is done safely, I just upgraded my card no problem at all.
DISCLAIMER: Do at your own risk, this will void your warranty.
1, If you want to be safe, open up your card to check the ram is legit 8gb. Looking for serial: K4G80325FB on 8 Ram blocks.
This takes some time but it's just a case of unscrewing and removing in the following order 1,case 2,heatsink 3,fan bracket (note 2 screws next to the HDMI port and unplug fan power connector) take it off and check.
2, nice, now reassemble (you need to clean gpu/heatsink and apply new thermal paste ideally)
3, download atiflash program and new bios.
8gb bios: https://www.techpowerup.com/vgabios/184327/amd-rx480-8192-160603
flashutil: https://www.techpowerup.com/downloads/2728/atiflash-2-74
4, extract atiflash util
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5, rename bios to 'bios.bin' and place in atiflash folder
6, run cmd as admin
7, cd to atiflash folder
8, use command 'atiwinflash -f -p 0 bios.bin'
9, reboot
Note I got a 'SubsystemIDs mismatch' when trying to update bios with atiflash windows program, cmd atiwinflash -f -p 0 bios.bin ignores checks and forces update.
EDIT: Some sites are reporting that all reference 4gb cards are 8gb cards with bios lock. A few people at overclockersuk have just rolled the dice without checking ram, I haven't read about any dead cards yet.
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Congrats you now have a 8gb RX 480 at a significant discount.
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