Fan speed reduction cable for small % change?

Fastfishy2 · Thursday at 11:56 PM

Long story short, I have a 240mm AIO and both the fans on it are daisy chained to my CPU fan header for control. All other fan headers are in use. The reason for this is, I need all the fans in the case running at slightly different RPM otherwise they tend to "harmonize" and create this kind of oscillating humming, which annoys me when I hear it. Especially if the fans are of the same model and run at the same RPM, this humming happens. Might just be my sensitive ears.

Basically I need something like one of those Noctua low speed cables, but with less % of speed reduction because obviously I don't want one AIO fan running significantly slower than the other, just enough to avoid them being at the exact same speed. I was thinking in the range of 10% or less. Does anyone know any decent products that will let me do that? Sorry, I know it's very specific.

Toothless · Friday at 12:06 AM

Why not change it in the bios?

Shrek · Friday at 12:10 AM

Silicone anti-vibration mounts might be all you need.

freeagent · Friday at 12:15 AM

I can hear the PWM pulse in some of my fans when they are at 12v, its a little annoying.. power onoffonffonoff.. stupid Noctua (iPPC)

That is on top of the monstrous sound they make haha

Fastfishy2 · Friday at 12:25 AM

Toothless said:
Why not change it in the bios?

Because both AIO fans are using the same header and are identical model.

freeagent said:
Give yourself Tinnitus, it helps.

Honestly, with my motorbike having the pipe it does, it will hopefully do that for me.

Dated an audiologist a while back and she said I had "exceptional" hearing. I feel like it's a curse. I don't want it.

Chrispy_ · Friday at 12:50 AM

If you're getting interference where both fans run at similar speeds and create a phasing on/off drone, you can usually get rid of the noise by putting filter in front of one and not the other(s)

If all fans in question are already filtered and there's no way you can run them off different headers, and no way you can relocate the fans, then you could try a second filter behind one of the fans to increase RPM and move that fan outside the phasing harmonics range. It's a waste of airflow but it's not as harmful as using one of those 7V low-noise adapters.

Fastfishy2 · Friday at 2:34 AM

eidairaman1 said:
Complains about being near a pc fan, try a turbofan

Yeah I'll pass, already had enough experience with low overflight turbo prop engines because I went to school right over the fence from an air force base. Big loud. Somehow still grew up with exceptional hearing. Idk.

I've found one more PWM header on my board but it's right in the middle of the mobo, so I've ordered a long blacked out fan cable so that I can run one of the AIO fans off that. Meaning I can set an almost identical fan curve, but ever so slightly lower speed at each point.

Processor	Ryzen 7 5800X3D
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Processor	Ryzen 7 5800X3D
Motherboard	Asus Strix B550-A
Cooling	Be Quiet! Dark Rock 4
Memory	Gskill Trident Z DDR4-3200 (16GB x 2)
Video Card(s)	Sapphire Pulse RX 7900 XT 20GB
Storage	Samsung 970 Evo Plus NVME 1TB (Boot), Samsung 970 Evo Plus NVME 2TB, Samsung QVO Sata 2Tb
Display(s)	Aoc 31.5" 1440p 75hz; Asus 24" 1080p 75hz (secondary)
Case	Be Quiet! Silent Base 802 White
Power Supply	Corsair RM750X 2021 w/ Corsair Type 4 Sleeved Red Cables

Fan speed reduction cable for small % change?

Fastfishy2

Toothless

Tech, Games, and TPU!

Shrek

freeagent

Moderator

Fastfishy2

Chrispy_

Fastfishy2

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