rx 480 flashing

[Deuxez]

Ive decided im going to try to flash my rx 480 to a rx 580, and ik the only diffrence is a little faster clock speeds etc, but if i undervolt it, i might get some more fps than the normal rx480. So to begin with, i got this gpu: https://www.techpowerup.com/vgabios/185855/xfx-rx480-4096-16080

and im wondering what i could flash it to, do i need to keep it within XFX? I looked around and found this: 

https://www.techpowerup.com/vgabios/192098/xfx-rx580-4096-170410

they are relative close to each other with clock speeds etc, but will it work? and if there are any other better bios i could flash it too, lemme know by posting link.

 

My card also got a bios switch on it, so could i just swtich it, and then flash, so i got the normal rx480 on one side and the flashed 580 on the other? could that also help me if i flash, and it gets bricked, i could just switch to the normal rx 480? Should i just switch it, boot up my pc, and flash it? or do i need to do something with the flash program? (gonna try to use ATI flash or whatever its called.)

 

Thanks

 

EDIT: if i flash bios to a 580 which gets less power than the rs 480, wont that improve my temperature too, and if it does that but very litte, i could just also undervolt it even more, since my rx 480 is currently running at around 78c+ when playing games, but only 67c undervolted.