PSU fan not spinning under full load!

[Tech Wizard]

Hello,

 

I currently bought a Corsair RX750M, paired with an i7 4930k overclocked to 4,4GHz @ 1.3V + an overclocked GTX 1070. The RM750X's fan is not suppose to spin before pulling 300W.

I have been stress testing my system in 3DMark Fire Strike, looping the "combined test" for 30 minutes, which pushes both the CPU + GPU really hard. Average GPU load was at 95 %, jumping from 90-100 % throughout the test, and CPU usage average was 45 %, jumping from 40-50 % in task manager. I know the 1070 only draws 150W under full load, but I NEVER saw the PSU fan spin once during this test, and I really pushed it. I also looped Graphics Test 2 in Fire Strike for 20 minutes, which is the most demanding GPU test in Fire Strike, putting my GPU load to 100 % constantly and never saw PSU fan spin. Also ran Intel Burn Test / Aida64 / Prime95 to grill my CPU, but PSU fan also didn't spin here. I am worried about the PSU in the long-run.

 

 

 

[Sakkura]

Well you're right around the 300W mark at full load with that system, so maybe you're just barely staying below the trigger point for fan activation. I wouldn't worry too much about it, in real-world use you'd be a bit lower than that as well, so you're really not putting unusual thermal strain on the PSU.

[Tech Wizard]

Just now, Sakkura said:

Well you're right around the 300W mark at full load with that system, so maybe you're just barely staying below the trigger point for fan activation. I wouldn't worry too much about it, in real-world use you'd be a bit lower than that as well, so you're really not putting unusual thermal strain on the PSU.

That's what I mean. I fear for the PSU / my system in the long run if the PSU fan NEVER spins, under any scenarios/workloads I throw at it

[creepybob]

fan is broken

[Tech Wizard]

4 minutes ago, creepybob said:

fan is broken

The thought hit me, but the fan spins for barely 2-3 seconds when I boot the PC. Does that count?

[tlink]

its probably fine, if you want to be sure measure what you're pulling from the wall in watts. thats gonna be a little bit higher than what you're pulling internally. if its below 340 watts than that simply means your internals are probably pulling less than 300 watts. this isn't an exact science but the 10 watts more or less really shouldn't make a huge impact imo.

[Tech Wizard]

1 minute ago, tlink said:

its probably fine, if you want to be sure measure what you're pulling from the wall in watts. thats gonna be a little bit higher than what you're pulling internally. if its below 340 watts than that simply means your internals are probably pulling less than 300 watts. this isn't an exact science but the 10 watts more or less really shouldn't make a huge impact imo.

Hmm, maybe I should hear with Corsair 

[tlink]

10 minutes ago, Tech Wizard said:

Hmm, maybe I should hear with Corsair 

you can do that if you want to be sure, but it wouldn't be surprising if your system pulls less than 300 watts. you can calculate it pretty accurately here. according to my estimate the max your system can pull is 320 watts. thats with 4 16gb ddr3 one 7.2k rpm hdd one ssd and graphics card completely unrealistically overclocked the max.

 

[knightslugger]

Idle vs. full 100% Aida64 load test

 

[Tech Wizard]

@Aniallation @STRMfrmXMN  @Energycore

[comicsansms]

Your PSU is fine, you will not will not be using 300W or you are below the tempreture profile that the fan starts at.

[Energycore]

Maybe the fan will spin if you do AIDA64 along with 3DMark. Otherwise nah you're not pulling 300W

 

I have a feeling the 4.4GHz CPU would approach 200W at full load, so barely 300.

[STRMfrmXMN]

The fan in the Corsair RMx comes on when it gets hot, not when it's under a certain load. So it's not hot enough.

[Aniallation]

12 hours ago, Tech Wizard said:

@Aniallation @STRMfrmXMN  @Energycore

It doesn't need to spin if not hot enough. Like the radiator fan on a car, it will only engage once the PSU is producing more heat than is able to be passively cooled.

[UrdnotGrunt]

I would agree with some ppl here that the fans activation point(s) wasnt exceeded. internal temp, total load, etc. My PSUs fan spins if the load exceeds 40% on eco mode. Never once has it spun since I bought it a year ago. The eco mode switch that it has is really nifty

[Tech Wizard]

20 hours ago, Energycore said:

Maybe the fan will spin if you do AIDA64 along with 3DMark. Otherwise nah you're not pulling 300W

 

I have a feeling the 4.4GHz CPU would approach 200W at full load, so barely 300.

I tried this, and it didn't spin here as well. I might mention that a GPU bottleneck happened when Aida64 pushed CPU usage to 100 %, so GPU load never exceeded 40-50 % in Fire Strike.

16 hours ago, STRMfrmXMN said:

The fan in the Corsair RMx comes on when it gets hot, not when it's under a certain load. So it's not hot enough.

13 hours ago, Aniallation said:

It doesn't need to spin if not hot enough. Like the radiator fan on a car, it will only engage once the PSU is producing more heat than is able to be passively cooled.

11 hours ago, UrdnotGrunt said:

I would agree with some ppl here that the fans activation point(s) wasnt exceeded. internal temp, total load, etc. My PSUs fan spins if the load exceeds 40% on eco mode. Never once has it spun since I bought it a year ago. The eco mode switch that it has is really nifty

 

To all 3 of you: It literally says on the box of the PSU that its suppose to start spinning when I pull 300W, and not certain temps. See picture in main post. 

Also from what you guys said, the PSU fan is not spinning because it's not getting hot enough, correct? Means I have decent airflow 

 

[Energycore]

2 hours ago, Tech Wizard said:

I tried this, and it didn't spin here as well. I might mention that a GPU bottleneck happened when Aida64 pushed CPU usage to 100 %, so GPU load never exceeded 40-50 % in Fire Strike.

That makes sense.

 

2 hours ago, Tech Wizard said:

To all 3 of you: It literally says on the box of the PSU that its suppose to start spinning when I pull 300W, and not certain temps. See picture in main post. 

Also from what you guys said, the PSU fan is not spinning because it's not getting hot enough, correct? Means I have decent airflow 

Your PSU fan is not spinning because you're not pulling 300W

[STRMfrmXMN]

5 hours ago, Tech Wizard said:

I tried this, and it didn't spin here as well. I might mention that a GPU bottleneck happened when Aida64 pushed CPU usage to 100 %, so GPU load never exceeded 40-50 % in Fire Strike.

 

To all 3 of you: It literally says on the box of the PSU that its suppose to start spinning when I pull 300W, and not certain temps. See picture in main post. 

Also from what you guys said, the PSU fan is not spinning because it's not getting hot enough, correct? Means I have decent airflow 

 

The box has branding on it to make it look good. The PSU has a temperature probe that detects when it's time for the fan to come on. You also are probably using almost exactly 300W so the fan may start spinning briefly at such low speed you can't hear it.

[Tech Wizard]

1 minute ago, STRMfrmXMN said:

The box has branding on it to make it look good. The PSU has a temperature probe that detects when it's time for the fan to come on. You also are probably using almost exactly 300W so the fan may start spinning briefly at such low speed you can't hear it.

I have it mounted upwards, so I have full vision on the fan. On a sidenote, when booting the PC, it spins for about 10 seconds, untill windows loading screen

[STRMfrmXMN]

3 minutes ago, Tech Wizard said:

I have it mounted upwards, so I have full vision on the fan. On a sidenote, when booting the PC, it spins for about 10 seconds, untill windows loading screen

My PSU fan spins all the time and I can barely hear after it boots up so I guess that makes sense. Also, why have the fan up? Stuck on carpet?

[Tech Wizard]

2 minutes ago, STRMfrmXMN said:

My PSU fan spins all the time and I can barely hear after it boots up so I guess that makes sense. Also, why have the fan up? Stuck on carpet?

Not really, on a table, and I have dust filter below case. Guess my last PSU (OCZ ZT)'s fan spinned at high RPMs even during idle, that it lowered GPU temps. Now with this RMx, idle GPU temps are like 2-3c higher than my OCZ  See pic in signature 

[STRMfrmXMN]

5 minutes ago, Tech Wizard said:

Not really, on a table, and I have dust filter below case. Guess my last PSU (OCZ ZT)'s fan spinned at high RPMs even during idle, that it lowered GPU temps. Now with this RMx, idle GPU temps are like 2-3c higher than my OCZ  See pic in signature 

Looks nice! I would flip it over myself though.

[Tech Wizard]

20 hours ago, STRMfrmXMN said:

Looks nice! I would flip it over myself though.

How come? It never spins anyways apparently

[STRMfrmXMN]

3 hours ago, Tech Wizard said:

How come? It never spins anyways apparently

Dust buildup and hot air being inhaled by the PSU if the fan does decide to come on cuz you got a hot GPU right above it.

[Aniallation]

On 1/1/2017 at 7:08 AM, Tech Wizard said:

I tried this, and it didn't spin here as well. I might mention that a GPU bottleneck happened when Aida64 pushed CPU usage to 100 %, so GPU load never exceeded 40-50 % in Fire Strike.

 

To all 3 of you: It literally says on the box of the PSU that its suppose to start spinning when I pull 300W, and not certain temps. See picture in main post. 

Also from what you guys said, the PSU fan is not spinning because it's not getting hot enough, correct? Means I have decent airflow 

 

Then again watts can be used as a measurement of thermal output too I guess