Corsair SF750 fan noise question

Midiamp

SFF Lingo Aficionado
Original poster
Mar 15, 2017
90
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michaeladhi.com
Just finished my build with Silverstone RVZ03. I used my spare SF600. Everything seemingly all right until I remember why I changed back to ATX, and that's because the SF600. I vaguely remembered that Corsair SF600 has an issue with its fan, whereby once it ramps up, it will never go down... As is what's happening in my case. Even at idle and with AC turned on (idle temp 26 degrees C), once I play a session or two in any game, the SF600 fans just kind of stuck spinning all the time. The fan currently is the noisiest part of my build.

My last build with an RVZ02 that I got commissioned was using an i5 + GTX 980 and Corsair SF450. I remembered exactly the PSU fan only starts to spin at around 140 watts and after a game session it relaxed, and even went idle again.

Just wondering if SF600 fans behave as intended, and if it's not, does the SF750 have the same behavior?

Right now, I need to restart my PC for the fan profile to relaxed, but then, it's very inconvenient to restart my PC everytime I game.
 

tinyitx

King of Cable Management
Jan 25, 2018
986
870
IIRC, SF600's fan considers both the load and the temperature. So, I suppose, after some gaming, the fan will not slow down immediately even though the load is now low as the temp sensor still senses higher temp inside the PSU.
 

Frenzy

Efficiency Noob
Feb 14, 2020
6
1
This behaviour is a common complaint with the earlier Rev. models of the SF600 as I undertand. Later versions and now with the SF600 platinum (io gold), the fan would stop again with lower loads. I currently have the SF600 platinum and the fan always stops again after spinning/high-load. Hard to say how quickly after load, quite quick because I've never noticed it emit noise. Unlike my earlier build Silverstone 450W ST45SF-G, where the fan noise became annoying.
 

Midiamp

SFF Lingo Aficionado
Original poster
Mar 15, 2017
90
47
michaeladhi.com
This behaviour is a common complaint with the earlier Rev. models of the SF600 as I undertand. Later versions and now with the SF600 platinum (io gold), the fan would stop again with lower loads. I currently have the SF600 platinum and the fan always stops again after spinning/high-load. Hard to say how quickly after load, quite quick because I've never noticed it emit noise. Unlike my earlier build Silverstone 450W ST45SF-G, where the fan noise became annoying.
Thanks, I need this confirmation. So the SF750 is a safe buy then, after all it's only $15 difference and to avoid getting an old stock of the SF600. In my country ITX/SFF is a very niche market, so for PSU, we only have Corsair SF450/600/750 and Silverstone SX500.

IIRC, SF600's fan considers both the load and the temperature. So, I suppose, after some gaming, the fan will not slow down immediately even though the load is now low as the temp sensor still senses higher temp inside the PSU.
Thanks for the input, I idle my PC for an hour under aircon, and the PSU fan never lower from its highest RPM. Restarting my PC lowers the fan but never until the moment it idles. Something about the temp sensing mechanism made it very sensitive to heat.
 

toomanyboxes

space man spiff
Bronze Supporter
May 27, 2019
8
2
Yes the SF 750 is safe buy. I have one and I am not sure I have ever heard the fan spin up yet. I am certain the fan spins while gaming but my GPU fan drowns everything out.

Added bonus - the 750 comes with sleeved cables versus ribbon cables

Thanks, I need this confirmation. So the SF750 is a safe buy then, after all it's only $15 difference and to avoid getting an old stock of the SF600. In my country ITX/SFF is a very niche market, so for PSU, we only have Corsair SF450/600/750 and Silverstone SX500.


Thanks for the input, I idle my PC for an hour under aircon, and the PSU fan never lower from its highest RPM. Restarting my PC lowers the fan but never until the moment it idles. Something about the temp sensing mechanism made it very sensitive to heat.
 

rfarmer

SFF Guru
Silver Supporter
Jul 7, 2017
1,568
1,515
Yes the SF 750 is safe buy. I have one and I am not sure I have ever heard the fan spin up yet. I am certain the fan spins while gaming but my GPU fan drowns everything out.

Added bonus - the 750 comes with sleeved cables versus ribbon cables
It's actually the Platinum versions that come with the sleeved cables and the Gold that come with the ribbon, you get sleeved cables even with the SF450 Platinum.
 

Midiamp

SFF Lingo Aficionado
Original poster
Mar 15, 2017
90
47
michaeladhi.com
Just a testimony, bought the SF750, and works as advertised. Fan doesn't spin on light loads, played games up to 180 watts off the wall, and it still doesn't spin. Same use case on my old SF600 gold, the fan will start to spin at 100 watts.

Also because the PSU fan doesn't spin, I now realized that RVZO3 PSU intake port aren't intake... It's actually exhaust port for the case. Now because the PSU fan never spins, hot air from the case fans are blown out the port, straight to my face.
 
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