This was fun. Currently working on 'silencing' my server too, only with bequiet silent wings fans. I've add 3 more fans over the stock for the case, and am about to explicitly cool two of the six hard-disks with two more, having relocated the two drives to the 5.25 inch bays. (They all fit into the 3.5 in drive bays, but over the summer, a couple of the disks went over 40 degrees C, which while still in specification, is too warm for me! Want the drives to always be below 40.) Using a PWM generator to control the fans that are cooling the disks (rather than the mobo) - at the moment just the two fans bolted to the hard-disks, but will migrate the 3 existing stock fans (which are noisy, and not PWM) over to my PWM system when I've bought three more bequiet fans. Bodging it hard, could really do with a 3D printer and the time to figure all out. Impressed with the designing in python.
I know late to the party, but if you dont put some blanks or drives in the open slots, you will not get an accurate noise or temp floor. Deltas on sound/temp change might be close but might also be way off. I noticed this with R730XDs with open drive slots drive temps climb and cpu temps drop.
