ReadyNAS Pro - Replace CPU Fan

I happened to just do a power supply swap.  The stock unit is a Seasonic 300W.  I picked one up on Newegg - Seasonic SS-300SFD 300W (Link) BUT - it will require modification.  You will need to buy a 4" 24-pin ATX power extension (e-bay) and you will need to swap the hard drive power connectors.

The original has (3) single 4-pin molex connectors for the drive board, a lengthy braided 24 pin connector and a 4-pin aux connector.

The new unit is more 'standard' and has (2) double 4-pin molex leads with a 4-pin diskette power connector (really?), one double SATA lead, the 4-pin aux connector lead and a 24pin ATX connector lead that is too short.

DO THIS UNPLUGGED PLEASE!!!!!

I removed the old molex connectors and reused, necessary for the SATA cable but I did it on all of them to be neater as the originals have the cables at a 90° offset to the connector (I want to leave room for a 38mm fan someday).

Put the empty molex connectors into the slots on the drive board and cable by cable (maintaining color order) cut to size (route cables first allowing room for fan) and press into the appropriate molex slot.  There are two black cables that doesn't matter if they are flipped.  Put the cap back on.  For each set of leads you want to be sure there is only one molex connected to the drive logic board.  The orange signal cable on the sata lead i just cut off and capped.

I highly advise against using the replacement power supply as is and using both molex connectors on one lead.  This works in a PC where there is a single drive on each molex, but in this chassis there are 3 power connectors supporting 6 drives, so each cable lead is already carrying a two drive electic load.  If you use two connectors off one lead you will effectively have 4 drives on one leg of the PS. It's possible the PS and cable can handle it, but I didn't crunch the numbers and it was easy enough to mod the connector.

Since it's the same unit, it's the same noise.  I was unable to find another PS that fit the bill.  Space is pretty sparse and there is a special mounting offset as well, so this is probably your best bet.  Other than the simple cable mods it was pretty much plug and play.