it might pass memtest but when booting into windows it might be vdrooping , recheck that the memory voltage and timings are set manually and not to auto. try uping the vdimm voltage by 1 or 2 notches, and see if that gets you into windows. Then if it does chech the voltages in windows to make sure they are the same as in the bios.
This happens to me on my 790, in the bios the voltage is stable but booting into windows it needs to have the voltage notched up and when booted in window the voltage is shown lower than in the bios.
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Originally Posted by 3.0charlie  My knuckles are bleeding from fishing through walls a new CAT6 network cable... I found fresh, untapped electrical outlets...  | "It's all in the Reflexes"-Jack Burton |