XFX 280X ''1 and 2'' switch

I'd have to look at a picture to know for sure, but switches on the card are usually dual-BIOS switches. They're common for cards meant to give you the choice between slightly quieter running and lowered power consumption or higher performance. They're also a good feature to have for people who flash the BIOS because they make it much easier to recover if you accidentally brick the card.
 
Thanks alot anyway!

I hope someone will know wxactly what does it mean.

Btw. if i decide to change BIOS, can i change from 280x dd to 280x black edition which has a bit higher clock speeds ?