GTX 970 G1 Gaming

[godsarmy4vr]

My 75% asic score G1 Gaming GTX 970 hits 1521MHz on boost on its own?
Is that common/normal? does that mean I can probably OC a lot or is it not worth OC'ing since thats already pretty high?

 

[godsarmy4vr]

Also is it possible for the card to boost too much and hurt your card