From my minimal investigations, it seems that the SP-PCM02-HE580-AC is from an HP 3PAR M6720, even then, most of those came with the PCM01 version that is 80+ Silver.
Being a glutton for punishment and exhausting my potential savings on science, I grabbed a set of Dell Compellent SAS Controllers to test. I ended up with some very interesting findings. More reading has shown that the compellent controller requires 2x psus powered before it will spin up any disks, not sure the truth to this, but it may explain some of my experiences.
I have 2 DS424x Shelves.
The original one I picked up years ago, we'll call this OG, has Xyratex 2008 on the PCB. OG came with 2x IOM3's, 4x X518a-R6 Power One branded PSUs. A later IOM6 (single IOM6 Controller, 3x Blanks) upgrade slotted in fine with no issues, worked on first boot;
The newer shelf I got recently, we'll call this FNG, has Xyratex 2010 on the PCB. FNG also came with 2x IOM3's, 4x X518a-R6 Power One branded PSUs.a later IOM6 (single IOM6 Controller, 2x Blanks, one IOM3 flipped into the blank position with no physical connection just to serve as a blank) upgrade slotted in fine with no issues, worked on first boot
Both shelves show power savings when moving to a TDPS-580BB / X522A psu. Currently running 2x TDPS-580BBs plugged in to the wall and switched on in both OG and FNG, with 2x X518a-r6 psus slotted in, but not plugged in to the wall (essentially blanks). Plugged in PSUs are in Top left and bottom right positions when facing the rear of the chassis.
When I swap the IOM6 for the Compellent in OG, with no other changes to PSUs or anything, the shelf immediately ramps up the two plugged in PSUs fans, and stays there, however the shelf ID registers and the device seems to be functional (I've only done idle testing so far, no usage testing yet). When I swap the IOM6 for the compellent in FNG the fans ramp up, but no shelf ID registers, after 30 seconds the fans go into full on combustion mode. The shelf ID never registers with the 2010 unit.
Since I only have one SP-PCM02-HE580, (looking for another one to satisfy proper testing) I have limited testing to one plugged in PSU, the PCM02. The rest of the 3x psus are slotted in but not plugged in, serving as blanks.
OG with a Compellent controller and one PCM02 will spin up fans in a more normal speed and fashion, register the shelf id. after 30 seconds the non plugged in slot 4 PSU will ramp its fan into full on combustion mode, while the PCM02 fan stays relatively tame. Unit seems functional outside of the excess noise from psu4.
FNG with a compellent controller and one PCM02 will spin up fans quickly, no shelf id registers, after 30 seconds the shelf goes in to full power fan mode. excessive noise, not usable.
So here is where I'm at. . . My understanding is that the 2010 and later Xyratex PCBs were more desired for IOM6 upgrades / high capacity drives. I have never had any capacity issues with my OG 2008 PCB, Ive got some 18TB and 14TB drives running fine. Im wondering what if any differences there are between backplane revisions. Some lockout must exist, either on the PSU, the PCB, or SAS Controller. I'm wondering if the HP SAS controllers are another route or if they are just clones of compellent. It seems I need at least another SP-PCM02-HE580 to test the psu4 fan speed issue when deploying in OG. The saga continues...