Haven't tried them yet, got them for a very small ITX build at 5600x and am waiting for a 3060ti small enough to fit in a case . However, I can confirm that it appears to be a 4000MHz CL16 with timings of 16-16-16-36 and @ 1.4v (the description shows 1.35v which made me skeptical but the kit that I received and photographed has the specifications above). "Samsung BD.
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