Working on an X10SRH board with the latest IPMI. Just a note, if you're using slow fans (like the fans on the Noctua NH-U9DX i4 I'm using) and set the duty cycle to something low, they'll drop below the lower critical threshold and the IPMI will spin them right back up again. Just lower the threshold to below whatever your fans are at to prevent that. (e.g.
ipmitool sensor thresh FAN1 lower 100 150 200)