Reduce speed of PC case fans.

[Voodoochild1974]

Hi
I have some Lian Li fans that are set to 800rpm at their lowest. You cannot go lower using its hub or using PWM in my motherboard bios, but I knew this to start with...but I want lower

I saw someone say that using DC to power them lets you drop the speed down to 400/500rpm, so I tried one fan and it worked. I was happy with that but when I hooked 3 fans up using a splitter; it wanted a higher current before the three fans would spin, and then when they did, they were are 800rpm.

Not sure how to get around this as one fan is fine, but if I use a splitter, it does not work.

The splitter and fans I used were 4pin, so I am wondering if I use a 3pin splitter, will that work?

 

[bug]

I take it buying the right fan(s) for the job is not an option here.

 

[Voodoochild1974]

I take it buying the right fan(s) for the job is not an option here.

The static pressure with these fans is very high and great for what I need, but there is 10 of them. 10 fans at 800rpm....could be better.
One fan works using DC, just not sure how to get around 3 or 4 splitter as that does not work (only tried 4pin)

 

[ThrashZone]

Hi,
You say you tried 3 fans on a splitter how about only two.

 

[Jose Jeswin]

How about a Deepcool Rockman?...is it possible for you to install one?

Or use a pci slot controller...

 

[The red spirit]

Noctua low noise adapters or diy resistor cables.

 

[freeagent]

I am using an LNA from my old D14 to tame a 92x35 4000 RPM fan.. works good.. resistor gets fairly warm..

 

[Voodoochild1974]

How about a Deepcool Rockman?...is it possible for you to install one?

View attachment 208033

View attachment 208034
Or use a pci slot controller...

Hi. Thanks for pointing these out but I want the fans to move as temps rise, rather than me having to adjust on the fly.
After testing more cables, it seems its current. If I use a 1 to 2 fan splitter, I can drop the rpm to 650, which is great, but if I use a 3 or 4 splitter the fans trip out.

 

[DeathtoGnomes]

Hi
I have some Lian Li fans that are set to 800rpm at their lowest. You cannot go lower using its hub or using PWM in my motherboard bios, but I knew this to start with...but I want lower

I saw someone say that using DC to power them lets you drop the speed down to 400/500rpm, so I tried one fan and it worked. I was happy with that but when I hooked 3 fans up using a splitter; it wanted a higher current before the three fans would spin, and then when they did, they were are 800rpm.

Not sure how to get around this as one fan is fine, but if I use a splitter, it does not work.

The splitter and fans I used were 4pin, so I am wondering if I use a 3pin splitter, will that work?

individual fan controls do better with 1-2 low watt fans.

Also, there is 3rd party software that when used in conjunction with a fan hub (also depending how its plugged in to the motherboard) could bring bring your fans down as low as you want. I find that better than depending on the BIOS fan curve.

 

[Voodoochild1974]

Noctua low noise adapters or diy resistor cables.

Hi. Sadly, buying 4 packs is a bit OTT and not 100% it would work.
Since found out a 1 to 2 splitter is ok (can drop to 650rpm from 800) and they still ramp up when temps rise, but a 3 or 4 splitter just trips the fans out.

individual fan controls do better with 1-2 low watt fans.

Also, there is 3rd party software that when used in conjunction with a fan hub (also depending how its plugged in to the motherboard) could bring bring your fans down as low as you want. I find that better than depending on the BIOS fan curve.

Tried speedfan but it does not see the lian li hub.

 

[Jose Jeswin]

Hi. Thanks for pointing these out but I want the fans to move as temps rise, rather than me having to adjust on the fly.
After testing more cables, it seems its current. If I use a 1 to 2 fan splitter, I can drop the rpm to 650, which is great, but if I use a 3 or 4 splitter the fans trip out.

I think the deepcool rockman can detect the processor temperature and adjust the fan speeds...it has a connector cable which connects to the motherboard cpu fan header and the processor fan cable is connected to the rockman...it just reads the motherboard cpu fan header voltage and adjusts fan speeds accordingly...its a long time since i used one of these....the manual might have more information..

 

[Voodoochild1974]

I think the deepcool rockman can detect the processor temperature and adjust the fan speeds...it has a connector cable which connects to the motherboard cpu fan header and the processor fan cable is connected to the rockman...it just reads the motherboard cpu fan header voltage and adjusts fan speeds accordingly...its a long time since i used one of these....the manual might have more information..

Hi.
I think I am just going to use all my fan headers and just split 2 per header. I know it will work and I have the space for the cables. It's just a shame that a double split is as best I can do. Thanks for ideas though.

 

[The red spirit]

Hi. Sadly, buying 4 packs is a bit OTT and not 100% it would work.
Since found out a 1 to 2 splitter is ok (can drop to 650rpm from 800) and they still ramp up when temps rise, but a 3 or 4 splitter just trips the fans out.

If you don't mind soldering, then you can buy some resistors, cables and connectors. That's all what those low noise adapters are. All you need to do is to calculate what you have and what you want to achieve and then buy resistors good enough so they don't catch on fire from overheating.

Well, if you have molex connector, you can ghetto swap 12 volt cable with 5 volt cable and have very ghetto solution, but I don't recommend this.

 

[Voodoochild1974]

If you don't mind soldering, then you can buy some resistors, cables and connectors. That's all what those low noise adapters are. All you need to do is to calculate what you have and what you want to achieve and then buy resistors good enough so they don't catch on fire from overheating.

Well, if you have molex connector, you can ghetto swap 12 volt cable with 5 volt cable and have very ghetto solution, but I don't recommend this.

Soldering and the likes is something I wish I knew...but don't.

 

[eidairaman1]

Hi
I have some Lian Li fans that are set to 800rpm at their lowest. You cannot go lower using its hub or using PWM in my motherboard bios, but I knew this to start with...but I want lower

I saw someone say that using DC to power them lets you drop the speed down to 400/500rpm, so I tried one fan and it worked. I was happy with that but when I hooked 3 fans up using a splitter; it wanted a higher current before the three fans would spin, and then when they did, they were are 800rpm.

Not sure how to get around this as one fan is fine, but if I use a splitter, it does not work.

The splitter and fans I used were 4pin, so I am wondering if I use a 3pin splitter, will that work?

Get different fans, they are speced for a reason

 

[Voodoochild1974]

Get different fans, they are speced for a reason

They are the highest spec static wise (vs speeds) which is what I want; I was just looking for a way to make them bend to my will
The solution I have is not ideal, but it's good enough and will only cost me £5.

 

[DeathtoGnomes]

Hi. Sadly, buying 4 packs is a bit OTT and not 100% it would work.
Since found out a 1 to 2 splitter is ok (can drop to 650rpm from 800) and they still ramp up when temps rise, but a 3 or 4 splitter just trips the fans out.


Tried speedfan but it does not see the lian li hub.

speedfan is outdated, CTRL+ is what I use now.

Assuming the LL hub is like other fan hubs, no they wont be recognized unless its connect via USB to be software controlled. The LL uni hub set up looks like a daisy chain on 1 controller. ( cant tell from search images)

Software-less fan hubs read fan speeds off a motherboard header and can be controlled with software like speedfan and ctrl+.

Software controlled fan hubs, like NZXTs GRID+, have very limited power and small number of fan slots.