I cannot get Radeon R9 Gamer DDR3-2400 memory to work with A10-7870K processor and ASUS A88XM-E motherboard.
How do I get this new AMD memory to work?
What happens when you set 2400Mhz? It might require you to tweak some voltage settings on your Motherboard if it is not stable.
I would try settings 2133Mhz and see if you can get that stable, then work from there on adjusted timings, speed and voltages on your board.