PSU with fan off mode

M76

[H]F Junkie
Joined
Jun 12, 2012
Messages
11,937
I'm looking for a PSU that turns off it's fan bellow a certain temperature / load level. I've found a few Seasonics that supposedly have a silent mode, but it seems to me that it's not a true fanless mode, just very low rpm. They say it's virtually silent, well I don't want virtually, I want actually silent. I'm very sensitive to noise.

I only need it for a home server, so it doesn't need to be super high capacity 450-500W would already be overkill for the purpose but I suppose I won't find this feature on any lesser units.
 

3dprophet

Weaksauce
Joined
Oct 9, 2020
Messages
80
You're thinking of the Seasonic Focus GM line that only has the low rpm fan.

The Seasonic Focus GX line has the true fanless mode. Phanteks AMP is also a re-branded Seasonic GX, but it will stay fanless until 40% load instead of 30%.

Corsair RM line also has this feature.
 
Last edited:

M76

[H]F Junkie
Joined
Jun 12, 2012
Messages
11,937
Corsair RMx/RMi get my vote. Avoid vanilla RM.
What's the difference? Apart from costing 50% more?
My retailer lists the return rate of each item, and the RMi has a significant RMA rate, while the RM seems OK, the RMx is not available.
 

auntjemima

Supreme [H]ardness
Joined
Mar 1, 2014
Messages
7,751
I'm looking for a PSU that turns off it's fan bellow a certain temperature / load level. I've found a few Seasonics that supposedly have a silent mode, but it seems to me that it's not a true fanless mode, just very low rpm. They say it's virtually silent, well I don't want virtually, I want actually silent. I'm very sensitive to noise.

I only need it for a home server, so it doesn't need to be super high capacity 450-500W would already be overkill for the purpose but I suppose I won't find this feature on any lesser units.

My EVGA is truly silent, but it's quite a bit more wattage than you want. It's a 1300w model and even when it's pushing 600w it still doesn't come on. Usually does around 800w. So, for you it would never come on.
 

Meeho

Supreme [H]ardness
Joined
Aug 16, 2010
Messages
5,333
What's the difference? Apart from costing 50% more?
My retailer lists the return rate of each item, and the RMi has a significant RMA rate, while the RM seems OK, the RMx is not available.
RMi and RMx (built by CWT) are the same except the software monitoring features in RMi. RM has different, inferior internals (Chicony). They aren't bad, but the new CWT models are top tier.
 
Last edited:

M76

[H]F Junkie
Joined
Jun 12, 2012
Messages
11,937
RMi and RMx (built by CWT) are the same except the software monitoring features in RMi. RM has different, inferior internals (Chicony). They aren't bad, but the new CWT models are top tier.
Since they offer 10 year warranty for the lower tier one as well I'm not going to pay the 50% premium. Software monitoring would be nice to have, but not for 50% more. Thanks for the suggestion. I'm getting an RM650.
 
  • Like
Reactions: Meeho
like this

Zepher

[H]ipster Replacement
Joined
Sep 29, 2001
Messages
18,355
EVGA with the ECO mode button does 0 rpm fan mode.
I believe my Corsair HX750 also does 0 rpm
 

M76

[H]F Junkie
Joined
Jun 12, 2012
Messages
11,937
That seasonic series doesn't seem to be available here, plus I already ordered the corsair.
 

Mchart

Supreme [H]ardness
Joined
Aug 7, 2004
Messages
4,327
Doesn't matter much at this point, but I find the Seasonic Prime units are indeed silent unless you've got the computer setup in like a listening booth and you're measuring for DB. I just can't imagine anyone hearing the fan on it in a normal office setup. Under all but the highest load conditions the fan spins at a very low RPM. Your central air fan in the house will make more noise, etc. You'd need a 100% dead silent room, with like no carpeting, bare walls, etc and you'd have a chance of hearing the fan.
 

MaxHughes

Weaksauce
Joined
Nov 24, 2020
Messages
95
I'm looking for a PSU that turns off it's fan bellow a certain temperature / load level. I've found a few Seasonics that supposedly have a silent mode, but it seems to me that it's not a true fanless mode, just very low rpm. They say it's virtually silent, well I don't want virtually, I want actually silent. I'm very sensitive to noise.

I only need it for a home server, so it doesn't need to be super high capacity 450-500W would already be overkill for the purpose but I suppose I won't find this feature on any lesser units.
Fan off silent mode: Then all the heat goes up into your case and your fans speed up. I don't know any users that demanded companies produce silent mode P/S.
 

MaxHughes

Weaksauce
Joined
Nov 24, 2020
Messages
95
I'm looking for a PSU that turns off it's fan bellow a certain temperature / load level. I've found a few Seasonics that supposedly have a silent mode, but it seems to me that it's not a true fanless mode, just very low rpm. They say it's virtually silent, well I don't want virtually, I want actually silent. I'm very sensitive to noise.

I only need it for a home server, so it doesn't need to be super high capacity 450-500W would already be overkill for the purpose but I suppose I won't find this feature on any lesser units.
Or just get the case off your desk. I run the case/modem/wifi across the room on a seperate breaker with an AC line conditioner for the P/S. Asus Thor 850/1200 are Seasonic's top platinum P/S with custom giant Asus heat sinks. Thor has a switch on the back for fan silent mode. AMD/Radeon/Asus/EK/Watercool I have never had a DOA or an RMA. G SKILL Royal and Sabrent GEN4 drives are perfect but I've only had them for a short time.
 

M76

[H]F Junkie
Joined
Jun 12, 2012
Messages
11,937
Fan off silent mode: Then all the heat goes up into your case and your fans speed up.
There is always one naysayer, who will tell you: No you can't do it! And you shouldn't even try!

lol.png


And it's not as if I just turned on the PC, it is running 24/7. Passive GPU sitting above the PSU seems pretty chill to me.

I don't know any users that demanded companies produce silent mode P/S.
And yet they clearly exist, and there is more choice than I expected. For profit companies rarely do things for which there is no demand.
 

Ready4Dis

2[H]4U
Joined
Nov 4, 2015
Messages
2,465
I've got an EVGA model with eco mode... Annoying as crap as it sits at zero RPM and intermittently turns on and off. I'd rather if it just sat at a really low rpm and didn't cycle. Seems more of a gimmick than a useful feature. It does this when I'm not even stressing my PC. It's a 1000w PSU running a 65w CPU and 125w GPU while typing in visual studio, just a tick above idle.
 

Luke M

Limp Gawd
Joined
Apr 20, 2016
Messages
461
I like the PSUs (such as many Seasonics) that give you a switch to select between always-on and semi-fanless, so you can choose what works best for a particular system.
 

echn111

[H]ard|Gawd
Joined
Jan 30, 2007
Messages
1,086
If you value slience and are happy to pay a premium for high quality, quiet components then the SilverStone NJ450-SXL Nightjar Platinum fanless PSU is a good option.

It calls itself a 450w PSU because it is fanless but the components themselves are the equivalent of much higher wattage fan based PSUs.

But as long as you have a reasonably normal system (i.e. not an SLI or threadripper or similar) and airflow, it'll be fine.
 

zandor

2[H]4U
Joined
Dec 14, 2002
Messages
3,560
I've got a Seasonic Prime TX-1000 with a fanless mode that seems to work. I'm not sure I see much point to it though. It has a fan on/semi-fanless button on the back and if I set it to on I don't notice any difference in noise levels.
 

auntjemima

Supreme [H]ardness
Joined
Mar 1, 2014
Messages
7,751
I've got an EVGA model with eco mode... Annoying as crap as it sits at zero RPM and intermittently turns on and off. I'd rather if it just sat at a really low rpm and didn't cycle. Seems more of a gimmick than a useful feature. It does this when I'm not even stressing my PC. It's a 1000w PSU running a 65w CPU and 125w GPU while typing in visual studio, just a tick above idle.

For sure. I also don't really like that it will let the components sit hotter than they need to, just because. I turned it off and just let the fan run. Never hear it. This is a 1300w EVGA.
 

roz1281

Gawd
Joined
Nov 1, 2004
Messages
616
I installed a new EVGA SuperNOVA GT 650W. It's got that auto ECO mode; there is no switch for it on the unit that I can see. It's been silent so far, other than when I ran benchmarks
 

MaxHughes

Weaksauce
Joined
Nov 24, 2020
Messages
95
I run the Asus Thor 1200 and like the Seasonic it's built on, it does have the switch. Two of the last three Silverstone P/S I've owned the 3.3 volt supply would drop so low in voltage it would kill the system.
 

evhvis

Limp Gawd
Joined
Feb 12, 2021
Messages
128
I've got a Seasonic Prime TX-1000 with a fanless mode that seems to work. I'm not sure I see much point to it though. It has a fan on/semi-fanless button on the back and if I set it to on I don't notice any difference in noise levels.

Depends on your noise levels from the computer in idle. Turning on the PSU-fan on my main computer more than doubles the noise level on idle (basically from very very close to the noise floor in the room to noticeable).

Does anyone have a suggestion for a "cheap" fanless PSU. Doesn't need high wattage, while build quality and power delivery needs to be decent. It is for a computer that will use between 30 and 160 watts, most of the time closer to 30 watts and be running 24/7. It is meant to be very low noise server with low powerdraw so having a PSU fan running is out of the question.
 
Top