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Asus P9X79 Deluxe - DIMM_B1 doesn't work

My system: Asus P9X79 Deluxe Intel Core i7-3820 Kingston KHX1866C9D3K4/16GX (4x4GB) The problem: both BIOS and OS tell that there's only 12GB RAM. In BIOS, DIMM_B1 slot marked "Abnormal" when ...