I have 3600 16-16-16 RAM on my Asus Zenith Alpha with 1950X.. DOCP does does not boot on those values.
However I notice I'm able to boot on 3400 an i made it stable but i have strange issue.. system when completely shuts down fails to properly come up during POST.
It tries 2-3 times (power off then power on .. etc) eventually It reports it failed to boot due to memory .. I have to go to bios just save the settings and system POST without issues for second time.
I changed now to ErP S4+S5 and how it always boots up twice, but i have not seen it fail competently to boot up during POST.
It looks like a bug ?