Originally Posted by kithylin
Basically the RX 580's are roughly +10% to +15% faster over a RX480, but using the -EXACT- same hardware the 480's have. We've found out that literally the only difference is a different bios with different settings. So for all the RX 480 owners, they just download a bios, flash it, and get a free upgrade to their existing video cards without having to spend a cent.
The only problem is.. it's not guaranteed to work, or may not work at all.. sometimes doesn't work, one user almost completely bricked their card. So.. Your Milage May Vary.. works for some, not everyone.
There is another truth out there.
With the exact same clock rates for gpu and vram a 480 bios is still faster. Related to ram timings, i assume.
Your gpu will need the same voltage for the same clockrates, the 580 bios can't change that. The stock vcore is up to 1200mV with the 580 bios, the reference 480 bios delivers 1150mV, the custom 480's usually 1175mV.
And the powerlimit is mostly a little higher on the 580's, but again, no need for the 580 bios there. plenty of alternatives.
So, the ONLY benefit from the 580 bios is the new powerplay thing, less power draw in some scenarios, that's it. And u have to clock your vram higher, for the same performance.