Can faulity mobo destroy psu?

[Chrissi84]

Hey guys,

a friend of mine got an B760-I iATX Board with an i5-14500. He ain't got much knowledge, so he used his setup with the newest bios and 2x G.Skill 16GB 6000 / CL-30 MHz Sticks (1.35V). He put Asus MCE 3.0 on. It maybe a coincidence, but the electric fuzz blew. He remember, that the psu made a click noise - like turning off the pc. It's an corsair rm750x psu. After turning electricity on, everythings works fine. He turns off MCE 3.0. Can be coincidence too, but he thinks, that mobo, psu and gpu (4060) cause for now on coil whine. Could it possible, that he damaged the psu by using MCE 3.0 or kind of?

Thanks a lot & best wishes

[Silent_Scone · Accepted solution]

Hi @Chrissi84 

If the system works fine since, I wouldn't be too concerned. You can check the rail voltages in the UEFI to see if they're within spec.

• +12V: ±5% (11.40V – 12.60V)
• +5V: ±5% (4.75V – 5.25V)
• +3.3V: ±5% (3.14V – 3.47V)
• -12V: ±10% (-10.80V – -13.20V)
• +5VSB: ±5% (4.75V – 5.25V)

1) PSUs produce their own coil whine. How much depends on the quality, type, specs, and size of the components used.

2) The graphics card also produces some coil whine. Again, how much depends on the quality, type, specs, and size of the components used.

3) Interaction between the PSU and graphics card can result in louder coil whine.

4) Coil whine is related to frequency and current.

5) Rapid changes in current demands (such as rapid load modulation when transitioning from low power state) is a major contributor to piezoelectric noise (some capacitor types are more prone to this).

6) As ripple frequency and other sources of power related noise can impact the level of coil whine, some combinations of psu and graphics cards may exhibit more noise than others. For a vendor, it is very difficult to account for all permutations because cost is a factor if you want to increase resilience to coil whine. There is only so much a vendor will or can do.

7) As current plays a part, the amount of audible whine will vary from system to system.

[Chrissi84]

Thanks @Silent_Scone . I bought a new psu RM750x 2024. Seems that it works now fine. But I'll take an eye on the voltage. Best wishes