Sandisk Ultra 3d slow speed

Hi recently i buyed a 500gb ultra 3d ssd, but the problem is the speed is not getting good as advertise that is 560/530, i run test with crystalmark and get around 430 read and 505 write, so i tried almost everything change sata cable, install drivers. if u guys need a picture i can send, maybe is better request RMA? ty for the attention.