I would like to know if anyone knows what the footnote means on the AMD website where it says that the max memory speed for the 8150 is 1866 but with a footnote reading exactly this, "1866 supported with 1 DPC (DIMM per Channel) in single memory slot motherboard designs." I would like to know if I would purchase two 8 gb dual channel kits to make 16gb total, would it be ok to have the four dimms each in their own slot running at 1866 dual channel. If not what is the highest speed I can have in the aformentioned configuration. I would really appreciate clarity on this.
Here is my motherboard model in case it is needed - Gigabyte - GA-990FXA-UD3 (rev. 1.0)
The CPU is guaranteed to be able to run one module per channel (one dual-channel kit) at 1866 speeds. If you run more than that, your CPU will automatically adjust the speed down to DDR3-1600 speeds. You can try to force the memory speed to 1866 and see what happens, the worst thing you will need to do is to reset your BIOS if it locks up.
Typically AMD's have issues with memory clocked higher than 1333 if you populate all 4 banks. If you plan on overclocking the processor then get a 16gb kit (2x8gb) 1866. You can always downclock the memory to 1333 if you cant get it working at 1866.
That was true of the Phenom II era chips, current Bulldozers are specced to run four modules in a dual-channel board at 1600 just fine.