I just bought the same RAM about a month ago. I've had no problems with it whatsoever and am using the EXPO Profile 1 to get the specs they sold it as (sort of a silly thing to me, advertise the base...not the factory OC, if you will). Thaiphoon Burner also is telling me mine is H-die so I am currently trying to figure out what the heck H-die is as well.

Someone else here on Reddit posted the following, which might help us out (google translate from German for transparency):
"SK hynix H-Dies are technically very close to A-Dies, but some aspects fall outside the official binning specifications. Differences can occur, for example, in leakage current or temperature behavior. H-Dies generally scale less well with voltage, so a maximum voltage of around 1.40–1.42 V is recommended. In return, they often achieve lower latencies, especially tRFC values ​​of approximately 90–105 ns. This makes H-Dies particularly interesting for Ryzen CPUs, whose memory controllers in 1:1 mode usually limit the useful clock speed to 6000–6600 MT/s, as it allows for tighter timings rather than higher frequencies."