Got a reply from support and got it figured out.  To directly control the fans you use:                                     cpu1  cpu2  REA1 ???? FNT1  FNT2 FNT3 FNT4 ipmitool raw 0x3a 0x01 0x00 0x00 0x00 0x00 0x20 0x00 0x00 0x00 (0x00 is auto, 0x64 is max like normal) so its missing the first 0x00 that this tool uses.   I would guess that the ???? should be a Rear2 fan is the motherboard had one. In terms of names, I'm seeing: CPU1_FAN1 CPU2_FAN1 REAR_F