Gpu bios influence

[Dannygc]

Hello,

I've been reading some reviews online about RX 480 models as I plan on purchasing one, and saw the xfx RX 480 gtr 8gb and loved it, they say it's the best overclocker so far, and I read someone say it's because XFX made A very good bios for that card. Is it possible for the bios to influence the card to that degree considering the custom bios 480 gtr overclocks well and the default bios g1 gaming overheats on stock clocks?? Basically what I am asking is:

"how big of an. Influence does a bios have in a graphics card(not taking core and memory clocks into account)?"

Secondly "would a power color red devil be a better buy even if it doesn't overclock as well but costs £215 vs £259 for the gtr??" Thanks in advanced