Here's the big fan running my #1 computer. The PSU and exhaust fans are disconnected. I hadn't realized I was getting a side window with the fan!
This is my view of my computer station. I had to take the pic from further back than I sit, but the angle on the computer is the same I see - and obviously, I can't see the left side of the computer or the new big fan. Also, any noise coming from the left side doesn't have a direct path to my ear.
At the moment, the best measure of the cooling in the system is the HDD suspended in the optical drive slot, which very reliably and predictably is 14C over ambient with that added opening you can see on the left edge of the bezel, low down. And it takes a couple of hours for that to stabilize - each time I adjust the fan controller!
And right now, I have to lean forward and put my left ear directly in front of the floppy before I can hear anything. That's cutting the distance to the big fan in half, which is a 12dBA margin if I remember my acoustics right. That's too big a margin; I like to adjust so that the computer just barely cannot be heard under the quietest conditions.
So my first looksee indicates the big fan either cools better than the two 120mm fans (exhaust and PSU) when barely inaudible, or
if the cooling is adjusted to be the same (14C HD2 rise), then the noise level is considerably below audibility from my normal position in front of the computer. I said first looksee, remember.
At the moment, there are no damping materials of any kind on the side panel, except for rubber fan mounts (Jab-Tech open-ear mounts). I wanted to see how bad the vibration noise would be with the big fan. There's no vibration noise whatsoever, just whoosh.
I need to do lots more tweaking and some 3AM listening and all that is gonna take some time. And when I finish that, apply some damping (as all the other major parts of my computer have) and repeat the testing to see what the difference, if any, is.
At the moment, it looks like I didn't waste the purchase price of the big fan.
edit: added "slot" and the following boast:
The only working fan in my Ever Case ECE3505, which uses a Ninja to cool the CPU, is a small fan that's only used for point cooling on the system HDD. Here comes the boast: my
Ninja is really
passively cooled, since there's no cooling fan in the case! True statement. The cooling fan is outside