I have MB A88X-PRO and CPU A10-7850K:
As you can see the BIOS shows the two RAM sticks, but shows "Total Memory: 4096 MB). If I put the second stick from B2 to A1, the BIOS and Windows sees 8GB, but single channel.
I tried loading optimized defaults - didn't help.
Is this a misconfiguration or a hardware problem (MB/CPU)?