my videocard core at 1200mhz but my memory stuck on 300mhz

processor.  amd a10 7700k black idition               

MOTHERBORD.  A88XM-A/USB3.1

VIDEOCARD.  POWERCOLOR. RED DRAGON. RADEON.  RX 480. 4GB GDDR5

VOEDING 700 WAT. ANTEC

WATERCOOLER.CORSAIR

CASE SHARKOON.

SSD. 250 GB.

DDR3 MEMORY 2400MHZ CASLANTASY 11.14.14.33.1

MY CORE CLOCK RUNS VINE AT 1200MHZ. BUT MY MEMORY STUCK AT 300MHZ FROM MY VIDEOCARD

DRIVERS FROM CD INSTALT.

AND TRYED AMD.COM DRIVERS INSTALT NOTHING WORKT.

I HAVE RADEON WATSMAN ONLY MEMORY STUCK.