BIOS v1813 did not allow activating XMP. My DDR5:
H5CG48AEBD
X018 229A
DTAGH950WZ5
SK Hynix/ by GeIL Polaris DYNA5 SLT 6400MHz/XMP 32-39-39-96 32GBx2 and 1.40v
GeIL China customer service: b2c@geil.com.cn support: info@geil.com.cn
DUAL DDR5 32GB GeIL 6400MTs
SPD
the configuration in the images below on 6000MTs was not stable either:
6000MTs unstable6000MTs unstable AIDA64
I left the configuration in the images below in a more standard mode, but activating NITRO and MBIST, so I left the timings up to the system. I preferred not to test stability in applications like TM5 because I know it will crash.
6400 default timingsAIDA64 6400 default timings