Hello to all of you who's reading this post.
I contacted Gigabyte support,regarding "auto overclocking" here is the replay :
Thank you for your kindly mail and inquiry. We suggest you to load default settings in OC GURU II. Since the frequency is dynamic, if it goes to 1429 from time to time please don't worry. Please observe the performance and temperature of this graphics card. If it works fine, you can feel free to use it. If you have any concern about the frequency, you may contact your supplier for further testing to see if it is normal.
Regards,
GIGABYTE
What I want to add is that after 1 week of use the card started to go down on temp ( I don't know how) but now it runs around 53-56 Celsius (The Crew,FarCry 4)