"Sapphire" Button. What's it Do?

[1405]

What does this "Sapphire" button does on my Vapor-X R9-270X? Nothing in the manual on it. Some Sapphire cards have and call it a BIOS switch. (Two BIOSs?) Some other cards have it and call it an OC switch. But nothing I've seen pertains to the card I have. Anyone know how I should use it?

 

[Quixit]

It switches between the card's two bioses. The "OC Switch" cards have one bios with overclocked settings and one with stock. If your card doesn't have the "OC Switch" markings it probably just switches between two identical bios chips. You'll only need it if you screw up a bios flash. Unless you have problems with the card it's safe to leave it alone.

 

[1405]

It switches between the card's two bioses. The "OC Switch" cards have one bios with overclocked settings and one with stock. If your card doesn't have the "OC Switch" markings it probably just switches between two identical bios chips. You'll only need it if you screw up a bios flash. Unless you have problems with the card it's safe to leave it alone.

Can I press it while the computer is running. Or do I need to be shut down?