[Need Help] 64GB DDR4 RAM works fine without XMP but 16GB disappears when XMP enabled. gaming computer builder

Hi guys,

I have 64GB of DDR4 RAM, 6 DIMMS are identical with timings of 2400MHZ @ 16-16-16-39 @ 1.20V the other 2 are the same brand and rated speed just with a different timing of 2400MHZ @ 14-16-16-31 @ 1.20V when I enable XMP which uses the first timing listed here only 48GB shows in the BIOS but wait it gets weirder the BIOS tells me the slots with the problem are D1 and D2 on my Asus X99-S the mixed RAM are not even in these slots they are in B1 and D1. Please help!!!

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