Can't understand how the limit of RAM (asus sabertooth x58, i7 990x, 2x 8GB & 3x 4GB )?

Good afternoon, decided to insert RAM more than the maximum claimed amount and surprisingly it worked. Although the site of the manufacturer indicated that the maximum memory 24GB and I is with 28gb available . To all this I do not clearly the case with the frequency, the site maximum 1066, I work on 1600. Can you explain how the restriction on the volume and it affects the deviation from 1066?
Trims: 2x DIMM2: Kingston HyperX KHX1866C10D3/8G, 3x DIMM5: Samsung M378B5273DH0-CH9.
June 14th 19 at 18:00
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