The Bull BladeServer 2021 was certified with some exceptions to the published specifications:
a maximum tested CPU speed of 3.6 GHz
a maximum tested L2 cache memory of 1 MB
Only the 32-bit version of Red Hat Enterprise Linux is supported on the Bull BladeServer 2021.
For additional information, the Hardware Certification is at: https://hardware.redhat.com/hwcert/show.cgi?id=165534