Look what I dug iup on Gigas site QVL for X370 Gaming 5 2x8 DDR4 3200 at the top
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I made a guess call and ordered Trident C15 3200 sticks. I think I'll end up pretty happy with these, even if I only get up to 3400/3600. Gonna seem like huge leaps compared to my 1600DDR3