The UEFI of the FM2A75M-DGS does not see the this memory as 1866. JEDEC reports only 1778, 1333, and 1066. If I set the RAM's speed manually to 1866, the system will not boot again until I clear the CMOS with the jumper.
This RAM does run at 1333 and 1600 on this system, so I manually chose 1600 and the system will live at that speed.
I don't usually have problems with Kingston.