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Corsair RMX 750 Fan: Load or Temperature ?

christizzz
By christizzz
in Power Supplies
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Hello,

The manual of the Power supply ( and on the box)... shows a Load-Fan RPM curve.
The curves shows that the Fan trigger @300W of Load.

Now the PC on idle does even get close to 200W...

I have an R7 3700X ( not overclocked) and GTX 1070 ( also not overclocked)...

THe PSU is silent.... however afte like 45min-1hour of light usage (internet browsing, text editing...) the PSU fan do kick in. It is not loud, its just i can hear it because my other fan cases are noctuas running @ 300-400RPM... so when the PSU fan kicks in i can hear a slight "wooosh"..again it is not annoying. but ia m confused because the box AND manual sates that the fan will kick in at 300W.

The PSU fan will run for like 10-15min... and then stop... and again an hour late they will kick in again...

The PSU is mounted with the fan facing down because i have a case with a filtered bottom.. the room temperature is 22-23C degrees.

Am i missing somehting ? the PSU is like 2 weeks old...
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I know for a fact that their fans are temperature controlled which is why yours turns on and off. They might also be able to override that if they get hit with a significant power draw, not sure on that one though.

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Posted
52 minutes ago, christizzz said:
Hello,

The manual of the Power supply ( and on the box)... shows a Load-Fan RPM curve.
The curves shows that the Fan trigger @300W of Load.

Now the PC on idle does even get close to 200W...

I have an R7 3700X ( not overclocked) and GTX 1070 ( also not overclocked)...

THe PSU is silent.... however afte like 45min-1hour of light usage (internet browsing, text editing...) the PSU fan do kick in. It is not loud, its just i can hear it because my other fan cases are noctuas running @ 300-400RPM... so when the PSU fan kicks in i can hear a slight "wooosh"..again it is not annoying. but ia m confused because the box AND manual sates that the fan will kick in at 300W.

The PSU fan will run for like 10-15min... and then stop... and again an hour late they will kick in again...

The PSU is mounted with the fan facing down because i have a case with a filtered bottom.. the room temperature is 22-23C degrees.

Am i missing somehting ? the PSU is like 2 weeks old...

The PSU's fan RPM is determined by load OR temperature.  If the load gets high, even in low temperatures, the fan turns on.  If the temperature gets too high, even at low loads, the fan turns on.

 

Also, if the +3.3V or +5V load is unusually high (like a lot of RGB fans), this might trigger the fan to spin sooner than later too as the DC to DC cards do not have their own heatsink.

 

What case are you using and what/where fans are mounted?

 

How do you know you're only using 200W of power?

 

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  • Author

thank you... here are moy components:

 

Asus Strix B550-E

R7 3700X No OC

GTX 1070 No OC

2x16Gb Ram Gskill Trident Z Neo

 

1 SSD Evo 850

1 SSD Evo 860

1 NVME Evo Plus 970

 

2x140 Noctua Fans ( NF-A14)  mounted as exhaust ( rear and top )

3x120 Noctua Fans ( NF-S12) mounted as intake ( front panel)

2x120 Noctua Fans (NF-A12) For the CPU cooler

 

the case has its own RGB:  Be quiet Purebase 500DX

 

 

Thanks

 

 

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Posted
13 hours ago, jonnyGURU said:

The PSU's fan RPM is determined by load OR temperature.  If the load gets high, even in low temperatures, the fan turns on.  If the temperature gets too high, even at low loads, the fan turns on.

 

Also, if the +3.3V or +5V load is unusually high (like a lot of RGB fans), this might trigger the fan to spin sooner than later too as the DC to DC cards do not have their own heatsink.

 

What case are you using and what/where fans are mounted?

 

How do you know you're only using 200W of power?

 

But fans not use that much power to make psu fan spin..dunno I suppose 10 W at max.

 

Please do not take offence for my apparent confusion or rudeness,it's not intent me to be like that,it's just my BPD,be nice to me,and I'll return twice better,be rude and usually I get easly pissed of...I'll try to help anyone here,as long as it's something I dealt with,and even if you think I'm rude or not polite,forgive me,  it's not me it's my BPD.

Thanks for understanding.

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Posted
5 hours ago, christizzz said:

thank you... here are moy components:

 

Asus Strix B550-E

R7 3700X No OC

GTX 1070 No OC

2x16Gb Ram Gskill Trident Z Neo

 

1 SSD Evo 850

1 SSD Evo 860

1 NVME Evo Plus 970

 

2x140 Noctua Fans ( NF-A14)  mounted as exhaust ( rear and top )

3x120 Noctua Fans ( NF-S12) mounted as intake ( front panel)

2x120 Noctua Fans (NF-A12) For the CPU cooler

 

the case has its own RGB:  Be quiet Purebase 500DX

 

 

Thanks

 

 

Ok.  If the fan noise doesn't bother you, I wouldn't worry about it. 

 

1 hour ago, frozensun said:

But fans not use that much power to make psu fan spin..dunno I suppose 10 W at max.

What's your point? 

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12 minutes ago, jonnyGURU said:

Ok.  If the fan noise doesn't bother you, I wouldn't worry about it. 

 

What's your point? 

Since I wanted to purchase this  PSU,I don't understand why fan kicks in when load wattage devices are plugged in (fans,HDD,SSD...)

I guess you design it that way.

 

Please do not take offence for my apparent confusion or rudeness,it's not intent me to be like that,it's just my BPD,be nice to me,and I'll return twice better,be rude and usually I get easly pissed of...I'll try to help anyone here,as long as it's something I dealt with,and even if you think I'm rude or not polite,forgive me,  it's not me it's my BPD.

Thanks for understanding.

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Posted
9 minutes ago, frozensun said:

Since I wanted to purchase this  PSU,I don't understand why fan kicks in when load wattage devices are plugged in (fans,HDD,SSD...)

I guess you design it that way.

Still don't understand.

 

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5 minutes ago, jonnyGURU said:

Still don't understand.

 

Doesn't matter really.

Thx for info.

 

Please do not take offence for my apparent confusion or rudeness,it's not intent me to be like that,it's just my BPD,be nice to me,and I'll return twice better,be rude and usually I get easly pissed of...I'll try to help anyone here,as long as it's something I dealt with,and even if you think I'm rude or not polite,forgive me,  it's not me it's my BPD.

Thanks for understanding.

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On 2/21/2021 at 5:41 PM, jonnyGURU said:

Ok.  If the fan noise doesn't bother you, I wouldn't worry about it. 

 

What's your point? 

thanks... no it doesnt bother me... it is still silent... i jsut noticed the additional fan woosh...:)

thanks!

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On 2/21/2021 at 8:55 AM, frozensun said:

Since I wanted to purchase this  PSU,I don't understand why fan kicks in when load wattage devices are plugged in (fans,HDD,SSD...)

I guess you design it that way.

 

SSDs, HDD, and other parts of the system draw from the +5v and +3.3v rails.

If the +5v rail components are running warm, that will trigger the cooling fan to turn on.

Same thing if it is the +12v or +3.3v, etc.

 

If +12v OR +5v OR +3.3v is warm, OR overall PSU is warm OR power is more than 300W = Turn on fan.

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Posted
6 minutes ago, -rascal- said:

 

SSDs, HDD, and other parts of the system draw from the +5v and +3.3v rails.

If the +5v rail components are running warm, that will trigger the cooling fan to turn on.

Same thing if it is the +12v or +3.3v, etc.

 

If +12v OR +5v OR +3.3v is warm, OR overall PSU is warm OR power is more than 300W = Turn on fan.

SSD running warm???U sure about that?

How much users nowdays use HDD,statistically?
HDD has mechanical parts and it's running warm,but SSD no waaay,please touch your SSD.
How warm? 25-30 C that is not warm.

 

Please do not take offence for my apparent confusion or rudeness,it's not intent me to be like that,it's just my BPD,be nice to me,and I'll return twice better,be rude and usually I get easly pissed of...I'll try to help anyone here,as long as it's something I dealt with,and even if you think I'm rude or not polite,forgive me,  it's not me it's my BPD.

Thanks for understanding.

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18 minutes ago, frozensun said:

SSD running warm???U sure about that?

How much users nowdays use HDD,statistically?
HDD has mechanical parts and it's running warm,but SSD no waaay,please touch your SSD.
How warm? 25-30 C that is not warm.

 

It's not SSD or HDD that is running warm, turning on the cooling fan IN the PSU.

Re-read my answer, I did not say ANYTHING about SSD / HDD temperature.

 

SSD and HDD and other components pull power from not only the +12v line, but ALSO the +5v / +3.3v lines from the PSU.

 

ATX Power Supply Pinout and Connectors | Computer supplies, Electronic schematics, Computer diy

 

ATX Power Supply Pinout and Connectors

 

When you say...convert +12v down to +5v, that 7v drop has to go somewhere.

That difference is lost as HEAT.

Intel Z390 Rig ( *NEW* Primary )

Intel X99 Rig (Officially Decommissioned, Dead CPU returned to Intel)

  • i7-8086K @ 5.1 GHz
  • Gigabyte Z390 Aorus Master
  • Sapphire NITRO+ RX 6800 XT S.E + EKwb Quantum Vector Full Cover Waterblock
  • 32GB G.Skill TridentZ DDR4-3000 CL14 @ DDR-3400 custom CL15 timings
  • SanDisk 480 GB SSD + 1TB Samsung 860 EVO +  500GB Samsung 980 + 1TB WD SN750
  • EVGA SuperNOVA 850W P2 + Red/White CableMod Cables
  • Lian-Li O11 Dynamic EVO XL
  • Ekwb Custom loop + 2x EKwb Quantum Surface P360M Radiators
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  • EVGA P2 850W + White CableMod cables
  • Lian-Li LanCool II Mesh - White

Intel Z97 Rig (Decomissioned)

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  • ASUS ROG Maximus VII Hero Z97
  • Sapphire Vapor-X HD 7950 EVGA GTX 1070 SC Black Edition ACX 3.0
  • 20 GB (8GB X 2 + 4GB X 1) Corsair Vengeance DDR3 1600 MHz
  • Corsair A50 air cooler  NZXT X61
  • Crucial MX500 1TB SSD + SanDisk Ultra II 240GB SSD + WD Caviar Black 1TB HDD + Kingston V300 120GB SSD [non-gimped version]
  • Antec New TruePower 550W EVGA G2 650W + White CableMod cables
  • Cooler Master HAF 912 White NZXT S340 Elite w/ white LED stips

AMD 990FX Rig (Decommissioned)

  • FX-8350 @ 4.8 / 4.9 GHz (given up on the 5.0 / 5.1 GHz attempt)
  • ASUS ROG Crosshair V Formula 990FX
  • 12 GB (4 GB X 3) G.Skill RipJawsX DDR3 @ 1866 MHz
  • Sapphire Vapor-X HD 7970 + Sapphire Dual-X HD 7970 in Crossfire  Sapphire NITRO R9-Fury in Crossfire *NONE*
  • Thermaltake Frio w/ Cooler Master JetFlo's in push-pull
  • Samsung 850 EVO 500GB SSD + Kingston V300 120GB SSD + WD Caviar Black 1TB HDD
  • Corsair TX850 (ver.1)
  • Cooler Master HAF 932

 

<> Electrical Engineer , B.Eng <>

<> Electronics & Computer Engineering Technologist (Diploma + Advanced Diploma) <>

<> Electronics Engineering Technician for the Canadian Department of National Defence <>

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Posted
On 2/21/2021 at 5:55 PM, frozensun said:

I don't understand why fan kicks in when load wattage devices are plugged in (fans,HDD,SSD...)

Can you clarify what do you mean by "load wattage devices"? Did you mean to write "low wattage devices"?

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32 minutes ago, frozensun said:

SSD running warm???U sure about that?

How much users nowdays use HDD,statistically?
HDD has mechanical parts and it's running warm,but SSD no waaay,please touch your SSD.
How warm? 25-30 C that is not warm.

 

Here is a DC-DC regulator (LTM4675) that we use at work.

It is taking 12V input, and outputting 3.8V.

With all the electronics running, it is sitting a 86*C, and with a Temperature 2 reading of 95.9*C

There is is no heatsink over the DC-DC regulator, just chassis / enclosure airflow.

Believe it or not, that LTM4675 is actually running at ~78% efficiency...

 

image.png.c243d0f0c3a52803d710044218297f0e.png

Intel Z390 Rig ( *NEW* Primary )

Intel X99 Rig (Officially Decommissioned, Dead CPU returned to Intel)

  • i7-8086K @ 5.1 GHz
  • Gigabyte Z390 Aorus Master
  • Sapphire NITRO+ RX 6800 XT S.E + EKwb Quantum Vector Full Cover Waterblock
  • 32GB G.Skill TridentZ DDR4-3000 CL14 @ DDR-3400 custom CL15 timings
  • SanDisk 480 GB SSD + 1TB Samsung 860 EVO +  500GB Samsung 980 + 1TB WD SN750
  • EVGA SuperNOVA 850W P2 + Red/White CableMod Cables
  • Lian-Li O11 Dynamic EVO XL
  • Ekwb Custom loop + 2x EKwb Quantum Surface P360M Radiators
  • Logitech G502 Proteus Spectrum + Corsair K70 (Red LED, anodized black, Cheery MX Browns)

AMD Ryzen Rig

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  • Gigabyte B550 Aorus Pro AC
  • 32GB (16GB X 2) Crucial Ballistix RGB DDR4-3600
  • Gigabyte Vision RTX 3060 Ti OC
  • EKwb D-RGB 360mm AIO
  • Intel 660p NVMe 1TB + Crucial MX500 1TB + WD Black 1TB HDD
  • EVGA P2 850W + White CableMod cables
  • Lian-Li LanCool II Mesh - White

Intel Z97 Rig (Decomissioned)

  • Intel i5-4690K @ 4.8 GHz
  • ASUS ROG Maximus VII Hero Z97
  • Sapphire Vapor-X HD 7950 EVGA GTX 1070 SC Black Edition ACX 3.0
  • 20 GB (8GB X 2 + 4GB X 1) Corsair Vengeance DDR3 1600 MHz
  • Corsair A50 air cooler  NZXT X61
  • Crucial MX500 1TB SSD + SanDisk Ultra II 240GB SSD + WD Caviar Black 1TB HDD + Kingston V300 120GB SSD [non-gimped version]
  • Antec New TruePower 550W EVGA G2 650W + White CableMod cables
  • Cooler Master HAF 912 White NZXT S340 Elite w/ white LED stips

AMD 990FX Rig (Decommissioned)

  • FX-8350 @ 4.8 / 4.9 GHz (given up on the 5.0 / 5.1 GHz attempt)
  • ASUS ROG Crosshair V Formula 990FX
  • 12 GB (4 GB X 3) G.Skill RipJawsX DDR3 @ 1866 MHz
  • Sapphire Vapor-X HD 7970 + Sapphire Dual-X HD 7970 in Crossfire  Sapphire NITRO R9-Fury in Crossfire *NONE*
  • Thermaltake Frio w/ Cooler Master JetFlo's in push-pull
  • Samsung 850 EVO 500GB SSD + Kingston V300 120GB SSD + WD Caviar Black 1TB HDD
  • Corsair TX850 (ver.1)
  • Cooler Master HAF 932

 

<> Electrical Engineer , B.Eng <>

<> Electronics & Computer Engineering Technologist (Diploma + Advanced Diploma) <>

<> Electronics Engineering Technician for the Canadian Department of National Defence <>

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Posted
6 hours ago, -rascal- said:

SSD and HDD and other components pull power from not only the +12v line, but ALSO the +5v / +3.3v lines from the PSU.

Nowadays 3.3v just isn't wired to SATA in most cases, so there's that.

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