Rx480 low core clock
 

I just bought a sapphire nitro+ rx480 8gb(used). The card's core clock shows up as 1276Mhz in radeon settings and i get the same speed in games too according to msi afterburner. The manufacturer website states that it could be either 1306 or 1342Mhz. Am i missing anything here? How can i make it perform at the intended clock speed? Thanks.

Your card has 2 bioses, one silent and one for gaming. There's a switch on the card, flip in the opposite direction. It's near the led button.