ASROCK X399 Gaming User Manual page 29

• If only two memory modules are installed in the DDR4 DIMM slots, then Dual Channel
Memory Technology is activated. If three memory modules are installed, then Triple
Channel Memory Technology is activated. If more than four memory modules are installed
in the DDR4 DIMM slots, then Quad Channel Memory Technology is activated.
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Fatal1ty X399 Professional Gaming Series
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