F3-14900CL9D-8GBXL Asrock FM2A75 Pro4-M AMD A10-5800K

[NHawk]

I started out with one set of F3-14900CL9D-8GBXL memory on the FM2A75 Pro4-M motherboard with the AMD A10-5800K and I'm trying to add a second set.

Now after reading as much as I could find on this, that may have been a bad idea. Everything I've tried to run the two sets together fails when memtest86 reaches the block move test and errors start happening.

I've tried each set individually and they work fine. It's only when I add the second set that trouble starts.

They do run fine at 1600 and pass all tests, but not at 1866.

I've tried everything I can find here and it's reached the point that I need to ask for help.

[Tradesman]

Never a good idea to mix sets, even of the same exact model - since you already have them try raising the DRAM voltage + 0.07 and the CPU/NB voltage + 0.10

[NHawk]

Fewer errors with those settings, but still errors in the block move test.

[GSKILL TECH]

The two kits may not be fully capable at DDR3-1866 since they are not matched.

Thank you
GSKILL TECH