RAM not recognized by ASUS X99 mobo

I have an ASUS X99 mobo that doesn't recognize DDR4 memory in slots A1 and C1.  Their mates in B1 and D1 work fine.  This is the recommended configuration and the board is new.  All four slices of RAM check OK.  No problem booting with all four slices installed.  Setup shows only two slices present.
GreatGreyWolfAsked:
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dbruntonCommented:
And if you swap A1 to B1 (and vice versa) and C1 to D1 (and vice versa) does the problem still occur?

If it does then use the warranty, you've just shown that there is a slot problem.

There is a possibility that the board doesn't like your RAM but you need to specify brand and size of that for us to make a judgement on that.
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GreatGreyWolfAuthor Commented:
I did and was hoping the board didn't have a bad slot.  Cheers and thanks.
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nobusCommented:
if you swap the ram sticks from A and C with the ones in B and D - what happens then?
the same ?
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GreatGreyWolfAuthor Commented:
Yup, which verifies all four slices of RAM are good.  Given the computer boots satisfactorily with all four installed,  I've concluded the board has at least one pair of bad RAM slots.
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nobusCommented:
yyes, i have to agree, along with dbrunton
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GreatGreyWolfAuthor Commented:
Thanks, confirmed bad channel and new mobo on the way.
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GreatGreyWolfAuthor Commented:
Yes, please close.  Bad RAM slots.  Replaced Mobo.
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