The GPU comes with a Pre-OC on it, inother words by default it runs at the set pre-OC as it's base freq. The Fury DRAM operate off PnP so they set them selves up to the 'Oced' freq/data rate (they also have XMP profiles if the PnP doesn't set to the spec timings/data rate (PnP setting will be determined by the BIOS)