Haven't tried them yet, got them for a super small ITX build with 5600x and waiting for 3060ti small enough to fit in a case. I can however confirm that this is a 4000MHz CL16 with 16 timings 16-16-36 and @ 1.4v (the description says 1.35v which made me skeptical but the kit I received and photographed has the specs above) , I also think it's the good old Samsung B-Die.
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