Thx men, I will try that. Can't wait :p

Yes, you only have to copy the timings with the polaris bios editor. If you want you can also modify the core clocl though i prefer adjusting these on Wattool.

Softwares you need to flash your bios:
- polaris bios editor 1.41
- latest version of atiflash (afaik you can't use the version allowing you to flash polaris cards with a msdos usb stick like previously so you will need to have windows installed to flash your cards).

If you are unsure about what your doing, you can easily find tutorials on youtube (just type RX480 bios flash)