OK i had the same issue tonight
Really frustrating
The trick is!!!!
Add 1 other mem chip to your mother board
BTW im also using 990 FXA GD80 - V2
I have the FX 8350 & the r9 290x
I bought 2 sticks of 4g hyberx blue some shit clocked @ 1866
ok so add 1 other mem chip to your mother board that...