Huh ? maybe folks who can sit in a room with 53 ddA AIO fans, but for me ..... I can't sit in that room, if I can tell a system is on with my ears, that is unacceptable ... and that's the way many water coolers from the pre AIO era want. Having a half dozen fans spinning at 2200 rpm is like trying to concentrate while someone is vacuuming the room. Take look at some of Darla's (IT Diva) builds, she wrote that post. I have seen builds on OCN with 3 or 4 (560mm) rads in push / pull. For rouine daily activity ... Sreadheets, AutoCAD, browasing, word processing, etc the fans don't even spin ... if fan curve calls for < 350 rpm, they shut off.
My Box ... right now, no fans spinning, system working in passive cooling mode.... many ole time water coolers use higher numbers of fans at low rpm to create a completely noise free build .... in the build below, fan rpm never breaks 625 rpm and understress testing they don't break 825 or so.
CPU & CPU OPT Header ==> Dual Swiftech 35x2 Pump
CHA_1 Header ==> Hub No. 1 ==> (6) PH-140SP fans on 420 rad in push / pull
CHA_2 Header ==> Hub No. 2 ==> (4) PH-140SP fans on 280 rad in push / pull
CHA_1 Header ==> Hub No. 3 ==> (6) PH-140SP case fans
The reason I have the fans or each rad on separate channels is that:
a) The larger rad is downstream of the GFX cards which produce 580watts of heat
b) The smaller rad is downstream of the CPU which produces 145 watts of heat
And while component order has no effect on heat exchange, its simply a matter of total in total out .... with temperature sensors on the in and out of each rad, I can balance the heat loading to be equal across each 140mm of radiator by having separate fan curves for each rad ... the lower 280 rad reacts 1st to a rise in coolant temp. The 420 comes in only if the 280 is not keeping temps below the curve. So if I am doing something CPU intensive, the 210 rad fans might never go om. But of you have one of those cases with a basement and twin 420's or 560's ... that's going to be 6 or 8 fans. I mean it generally doesn't become an issue because from a performance / noise ratio ... folks aren't picking these fans anyway
My 28 year old son's box has a Swifthech AIO w/ 2 rad fans, (7) case fans .... two on back of storage cage blowing air above and below GFX card area