From what I can remember, at least temps were showing and some fan speeds for the gpu but they might have been way off, need to double check them. Have been playing with Win8 RP last few days... I'll fire up the Hack when I get to the office on thursday or so.
I can definetly post screenshot as...
Umm, I did remove my Win disk when I first gave it a shot but subsequent (successful) Lion installs I did have my other disks in.
Did you try to install to another disk? Oh, and I installed to a non-raid standalone (SSD) SATA disk plugged in to a SAS port (port number should not matter as well...
Just thought to contribute my findings so far:
HP Z800 Workstation
PSU: HP 1.1 kW (1100 W)
CPUs: 2 x E5620 2,4 Ghz 4 core
RAM: 12 GB DDR3
HDD1: 4 x HP SAS 146 GB 15k 3,5" RAID-10
HDD2: 2 TB Western Digital SATA 3,5"
HDD3: 128 GB Kingston SSD 2,5"
HDD4: 160 GB Toshiba SATA...