I asked on email Asus, Gigabyte, Asrock and Sapphire regarding 2 warranty on Amazon and this was there similar answer:
"Warranty is given by seller and it cannot be extended by anyone else. If you want to have full 3 years warranty, please found other seller who will provide full 3 years warranty period."
So if I buy mbo or gpu from Amazon I will have only 2 years of warranty.