Chassis/Case fan not recognized by BIOS, Speccy and SpeedFan but still working at minimal RPM

Jun 27, 2018
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I bought a GPlay Samurai PC recently and several things caught my eye.

1. Since I was dumb enough to enable the "Chassis Intrude" protection it kept giving me that error and locking me out of BIOS. I had to open the case and remove the CMOS battery.

2. When I first started the computer the Chassis fan on the rear panel wasn't working, but still lit by the bright blue LEDs.

3. When I opened the case my front panel USBs weren't connected to the motherboard, so I connected them. However, their cable was stuck in the aforementioned fan's blades, possibly blocking its spinning.

4. The fan is connected via a small cable to a 4-pin cable coming from my SSD, and I can't find a free spot to connect it to the motherboard (the fan still works, mind you).

Now, to the real question.
On my older system my CPU fan worked at 950-1000 RPM regardless of temperatures. I didn't know that until recently, because it used to be controlled by the BIOS and wouldn't respond to SpeedFan's manual control. Then I installed Speccy and it showed the same 950ish RPM at SEVENTY DEGREES CELSIUS! I went into the BIOS, disabled "Smart Fan" and the CPU began spinning at 4500 RPM immediately. Now SpeedFan controls it.

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(Ignore the clock generator by the way. I never intended to overclock my CPU; set it out of curiosity but it isn't active [no ACER motherboards are in the list anyway])

How does that tie to my new system?
SpeedFan shows a bunch of Aux/GPU fans with 0 RPM, which don't exist. I was like "Sure, it's a 6-year-old PC, the motherboard must be pretty outdated". But when I installed Speccy and SpeedFan on my new PC they also show non-existent Aux Fans at 0 RPM, don't detect my GPU Fan (as if I don't have one) or the Chassis Fan.

My CPU Fan is being controlled by the BIOS, the GPU Fan - by GPU TweakII (came with the drivers), but my Chassis Fan is not being controlled by anything and I'm missing on at least 33% extra cooling if ever needed, right? So, how can I make my motherboard (BIOS) or any software detect and control that fan, if possible?
 
Non existing fans showing 0 rpm is normal because there's nothing turning. GPU fan would be controlled by GPU and as some are just with 2 wires it has no way of reporting rpms. That chassis fan may be controlled by BIOS.
 
Jun 27, 2018
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It isn't because even the BIOS doesn't detect it.
 
Jun 27, 2018
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Only 1 wire, connected to a 4-pin connector coming from the SSD.
 
Jun 27, 2018
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Well, yeah, it has only the two wires that give it power. But they do come from the unconnected SSD cable.
 
Jun 27, 2018
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It's totally quiet. Unless it can't turn at more than silent speed...