I know you dont want to hear this, but can you borrow a psu from someone to try, at least that way you can rule it out and point directly to the board.
I cant see that this issue is caused by your ram.
I have two psus here, a tagan 900 and a galaxy DXX 850. either psu will run this board without any kind of cold boot problem, both will even run crossfire without problems.
My only issue [not really any issue, more about my expectations] seems to be a brick wall at 4.2 with ht on, but that in my case I think is the cpu needs to be sub zero. other than that the board seems to be very stable. as long as it will achieve whatever overclock I want it never crashes or ceases to boot.
In my opinion and experience so far, this x58 version is more consistant than my [three] rampage extreme x48 boards were. I had similar issues to what you are experiencing with those. and did wonder if it was to do with the power phases on the boards.
Its like if it were a car, its like the starter motor is faulty which would translate in computer terms to power phases or psu.
I know thats not a great analagy but kinda the way I think in terms of the issue when Ive had it with previous boards.
I have an asus commando that does a similar thing. I have to go through a ritual to get it to boot. I know the process so live with it but in your case [x58] and its cost its not acceptable and I know your frustration.

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