po7-655 Weird noise form PC under load, it might be AIO issues?

Yalador

I have had a weird noise coming from my pc recently, and its only when my pc is under load, at first i was like "alright its probably normal" but im not so sure cause it sounds like someone is using a buzz-saw from a distance! I have tried pinpointing the sound and it only happens when my cpu fans increases in speed (tried with predator sense) so i might be my AIO having issues?

[Edited the thread to add issue detail to the title]

[Edited the thread to add model name to the title]

GotBanned

Morning!

What is the model of your PC? What CPU and GPU do you have?

Are you sure that there's nothing hitting any of the fans, a cable or something like that? Do the fans spin easily when you manually flick them with your finger (a bearing might be shot)?

Is it possible that the sound comes from the water pump? There might be air bubbles in the loop, or its bearing might have a problem.

How are the temps, fan and pump speeds when the PC is under stress?

Axxo

This is called "Coil Whine" that comes from the inductor on the motherboard or graphics card, or in the power supply. An inductor is a passive electronic component that is capable of storing electrical energy in the form of magnetic energy.
When the vibrating frequency goes up to the range that the human ear can hear, that causes the sound reported.

As for how to fix this, there's no definite way, but there are some methods we can try to improve this:

Replace the modular power cable on the power supply unit if using modular cable.
This is because some of the cable come with the power supply that will have a capacitor on it, and some do not. Capacitors is a good factor for current stability which could solve the coil whine issue in some cases.
Replace the power supply unit.
Replace the motherboard.

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Yalador

https://community.acer.com/en/discussion/comment/1299382#Comment_1299382

Morning!

Lets see, a predator po7-655, it has a i7-14700KF and a 4080 RTX, i will check the fans after i get back home.

The temps are fine while under stress the fan speed of most fans except the CPU is stable and the sound comes whenever the fans of the CPU shows 800-1500 RPM so thats why im assuming its one of the fans of the AIO, also i gently moved all cables near the fans and AIO to make sure it wasnt a cable unless its a cable i cant see from the glass panel side!

Yalador

https://community.acer.com/en/discussion/comment/1299384#Comment_1299384

I would have thought so aswell if it wasnt for the noise coming from around the CPU area. And isnt coil whine usually a high pitched screeching?

GotBanned

I'm not so sure it's coil whine either.

I believe you have two fans on the AIO and three on the GPU. Try to see if something is between a fan and the radiator.

I don't know how and where the AIO fans are connected, but if possible unplug one fan and see if the noise goes away. If not, replug it and try the other one. For a more adventurous method keep on reading. ^^

As for the GPU fans (can be done to AIO fans as awell), when you hear the sound slow down one of the fans for a short while by applying little force to the center hub with your finger. Just be careful not to touch the fan blades! You don't need to stop it, just lower its speed. If the sound changes or goes away, you fould the source.

Yalador

https://community.acer.com/en/discussion/comment/1299454#Comment_1299454

I actually tried slowing down the fans and found it is the fans of the radiator, so i sent Acer support a message and they told me to send it in for a hardware repair

billsey

Be sure and let us know what they find…

Yalador

https://community.acer.com/en/discussion/comment/1299639#Comment_1299639

well i havent sent it in yet cause im waiting for their instructions, but thanks to a friend of mine we figured out its the pump, its sitting at 9000 RPM even when not under load so it seems to be defective/faulty so hopefully they will replace it or offer a different option

StevenGen

https://community.acer.com/en/discussion/comment/1300157#Comment_1300157

Just to assist you further and what to look out for after the AIO has been replaced. The below caption is the oem CPU AIO water cooler which is a Cooler Master 240mm oem AIO water cooler for the PO7-655 desktop as per its SG and its Acer part number highlighted.

This 240mm AIO cooler should be fully covered under the Acer warranty, and they should replace it with a new one, but even the new replacement parts could have a design flow so monitor the new AIO cooler closely after its been replaced and that it works 100% and cools the CPU properly, as this is critical and if not then you need to get Acer to replace it with a different brand name 240mm AIO cooler. Good luck and hope this helps you out.

If this answers your question and solved your query please "Click on Yes" or "Click on Like" if you find my answer useful👍

Yalador

https://community.acer.com/en/discussion/comment/1300170#Comment_1300170

oh thank you so much, sorry for the late response been quite busy! Yes I will for sure keep an eye on it from the second I get it back and up and running and see if it have problems, I think they should really not have the same connector for CPU fan and Pump fan. I think it somehow disrupts each other.

billsey

The PO7 models do have different connectors for the CPU fan and the pump fan. What may be confusing you is that the motherboard is used on both the PO5 and PO7 models. On the PO5 connector #4 is used for the CPU fan, and regulated to set the CPU temperature. On the PO7 models that is for the pump and regulated the same. The "CPU fan" on the PO7 is actually the fans for the radiator, #3 which run at constant speeds.

Yalador

https://community.acer.com/en/discussion/comment/1300975#Comment_1300975

so the noise coming when my cpu fan in the monitor software (predator sense) goes to 800-1100 (sometimes higher) is the radiator fan doing the noise? also Acer just mailed me saying the repair was complete but i wish they told me what they actually did "repair" so i could know what the issue actually was but i hope the noise will be gone!

billsey

With a PO7 the radiator fan should be held at a fairly constant speed, though it's possible they are modulating that as well as the pump speed. The SG doesn't give fan tables, like they do for most of the gaming laptops, but the block diagram gives a slight hint:

That leads me to believe they are driving both the CPU_Fan (which is really the pump) and up to five system fans off the same chip, so it's possible they are modulating all of them. They would all be modulated to the same speeds though.

Yalador

yea but the the cpu fan speed in predator sense controlled pump and radiator fans and as i said when the cpu fan speed showed above 800 rpm is when the noise started and it overpowered even high noise action like doom eternal through my headset but i get it back on Wednesday so we'll see if its better or not

Yalador

well i got it back today as they promised, except it came back in an even worse shape than before, the power button is stuck pressed down so it cant power on, there is a dent near the power button and the few seconds it started after hitting the back side power button on greeted me with the noise i heard before i sent it in so it not only didnt get repaired it also got damaged more! Im kinda disappointed about this

GotBanned

Sorry to hear that. Is it too late to get a refund? The least they could do is to send you a completely new unit.

Yalador

https://community.acer.com/en/discussion/comment/1303478#Comment_1303478

its too late for a refund yes, the refund time was 1 month and i had it 3 months before the issues started, and i doubt acer would actually send me a brand new unit in exchange for mine

billsey

Yeah, usually a swap out like that is done by the vendor. It sounds like the damage might have been done in shipping though, so perhaps a claim filed through the shipper is best. That claim is likely going to need to be filed by the service center, so get back in contact with Acer support and have them start the process.

Yalador

https://community.acer.com/en/discussion/comment/1303500#Comment_1303500

yea i already sent a ticket to support so we will see what will happen and by vendor do you mean acer or the place where i bought it? cause the swap was done by acer in germany

GotBanned

The EU has very strict laws and regulations in place concerning buying and selling goods. Here is something that should help you in case the seller tries to weasel out.

"The trader is responsible for any damage to your goods from the time they are dispatched until you receive them. So, if when you receive an order you made online, from a catalogue or by telephone, you discover your goods are faulty or don't work as they should, you are entitled to ask for them to be repaired, replaced or, where neither is possible, you can ask for a price reduction (on your original purchase) or a refund. Remember that you always have a 2-year minimum guarantee at no cost. This 2-year guarantee is your minimum right, however national rules in your country may give you extra protection."

https://europa.eu/youreurope/citizens/consumers/shopping/shopping-consumer-rights/index_de.htm

In Finland we have an independent "Consumer Disputes Board" that helps consumers with disputes with businesses. Maybe you have something similar in Germany? I also found the following from HERE.

• "The basic statutory limitation period (German: “Verjährungsfrist”) is two years starting from the time the defective goods are delivered to the buyer."
• The curing of the defect proves unsuccessful. An attempt to subsequently remedy a defect (German: “Nachbesserung”) that fails twice is deemed an unsuccessful cure.

I hope all goes well and Acer/store fixes this asap.