I wanted to restore it back to the original configuration so I could use the PWS-920-SQ power supplies instead of the original power supplies that came with the server chassis. The original power supplies screamed like banshees when they were in operation and were entirely to loud, which is why most of us modded the chassis so we could use a standard PC PSU. The downside of doing that is that you lose the mounting brackets for the extra drives on the side of the PSU enclosure. I run unRAID in my server and I currently use an SSD as a cache drive in my setup. Right now the cache drive is just propped up inside the case and not really attached to anything. UnRAID now supports dual parity drives and I would like to take advantage of that, but I have nowhere to mount a full-sized drive with my current setup. Restoring the original configuration allows me to mount both the cache drive and the 2nd parity drive on the side of the PSU enclosure.What's the reason for restoring your SC846 chassis to the original configuration? I still have an 846 that I bought from a fellow forum member here a few years back that was modded also and have a few times thought about restoring it back to original spec as well (minus the loud fans). Only thing is I don't know where the PS dist board and related components can be found. Plus one of the 846's has something the others did not, and that was the air shroud that went over the motherboard (fans blew over it).
In addition, the original PSUs were only rated at 720 watts. The PWS-920-SQ is rated at 920 watts. I was using an 850-watt Corsair PSU in my setup, which consists of a single parity drive, one cache drive, and 28 data drives, 24 of which are mounted in the server drive bays along with the parity drive. The extra five drives are located in an external enclosure that are connected directly to the SATA ports on the motherboard and run off the internal PSU. The 24 internal drives are connected to three 8-port SATA controllers. The cache drive is connected to the 6th onboard SATA port on the motherboard. I have an additional dual-port SATA controller located in a X1 PCI-e slot. I'll move the cache drive to that controller and use the onboard SATA port for the extra parity drive. That still leaves me with a spare port if I ever want to add a 2nd cache drive. The PWS-920-SQ PSU gives me the extra wattage to support the additional drives.
I had to restore the original fan wall in the process. I replaced the loud 80mm case fans with Noctua 80mm fans. The case isn't as cool as it was before, but the drives are all still operating within acceptable temperatures so I'm not concerned too much about it.
BTW, not all of the servers came with the air shroud. The shroud is designed for maximum air flow across the CPU and memory from the front to the back of the case. The air blows through it, not over it.