Stay away from any modules based on Micron ICs (Crucial is Micron).
Their ICs do no work properly on any AMD IMC since 12h.

For 15h parts (Kaveri, Richland, Trinity, Vishera, Zambezi) you want either Hynix or Samsung based modules.
KHX16LC9K2/16X for example is always based on 1.35V Hynix MFR variant.

On APUs the timings are completely irrelevant, the only thing that matters is the frequency.

On Richland you should be able to do DDR-1866+ with four dual rank modules.