Question My Desktop keeps shutting down, On Hwinfo64, the AVCC voltage keeps dropping until the pc shuts down.

Nov 10, 2024
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So, my pc keeps shutting down randomly. PSU IS corsair rm850x shift. It started this issue after about 10 days of use.
Now, the first time it happened, i gave it a break for about 16 hours, then turned of my pc. It started working, but this time i kept an eye on PSU voltages on hwinfo64. What happened is that it worked well for about 3 hours, then the (+3v) avcc voltage kept going down by about 0.016v per half an hour or so. Then from the initial value of 3.312 it reached around 3,056, then all of a sudden pc shut down (after running it for about 5.5 hours)
Then again I gave it a break for about 12 hours. In the morning i booted it up, immediately noticed on hwmonitor that this time the initial avcc voltage is 2.264 to begin with. This time the voltage kept dropping by 0.016v rather more quickly than befire, and pretty soon it reached the value of 3.056, and a few seconds after, the pc shut down (after running for about 2.5 hours)
This was my hwinfo64 readings during shutdown:
Avcc 3.056 (or lower)/ 3.312
3vcc 3.296/ 3.312
5v : 4.960 (sometimes 4.880)
12v: 12.00v
3vsb 3.056 (this one kept following the avcc value more or less)
Vbat: 3.1+ as far as i remember

I think my psu is faulty. Can someone shed some light on what this avcc voltage is and what it does? Most of the time i just hear about the 12v rail voltage, which looks fine in my case, but the pc shuts down as the avcc reaches a critical value, crossing the acceptable 5% deviation from standard value.
I am not the most knowledgeable person on PSUs. Your help and guidance will be appreciated.
My specs:
Ryzen 5800x cpu
Radeon 6800xt gpu
16gb ddr4 ram
Corsair h100i 240mm liquid cooler
Msi mag x570 tomahawk wifi mobo
6 montech cooling fans
Corsair rm850x shift 850w psu

I dont overclock anything. I also keep my ram xmp disabled.
 
Last edited:

Lutfij

Titan
Moderator
Welcome to the forums, newcomer!

I think my psu is faulty.
I think you should contact your seller and Corsair to help initiate an RMA. Yes that what you've described above isn't normal. I've noticed a handful of threads and instances on the www that Corsair's Shift series were faulty/failing.

Msi mag x570 tomahawk wifi mobo
BIOS version for your motherboard?
 
Nov 10, 2024
4
0
10
Bios: ami bios
Version: 7C84v1H
Released: 2024-08-09

Also, my shift rmx850 seems to have capacitors with holes in them, is it normal?
View: https://imgur.com/a/u6ImyAd

The first 2 are mine, the last one i found on the web, someone was conductinc tests on this psu. The red small ones and the small chocolate colored ones have holes on the top.
I have never seen capacitors with holes on any other psu i had used before, so i am not sure.
 
Last edited:
Nov 10, 2024
4
0
10
Welcome to the forums, newcomer!

I think my psu is faulty.
I think you should contact your seller and Corsair to help initiate an RMA. Yes that what you've described above isn't normal. I've noticed a handful of threads and instances on the www that Corsair's Shift series were faulty/failing.

Msi mag x570 tomahawk wifi mobo
BIOS version for your motherboard?
Tom's Hardware Forum
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Question My Desktop keeps shutting down, On Hwinfo64, the AVCC voltage keeps dropping until the pc shuts down.​

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luissust


Nov 10, 20242010

So, my pc keeps shutting down randomly. PSU IS corsair rm850x shift. It started this issue after about 10 days of use.
Now, the first time it happened, i gave it a break for about 16 hours, then turned of my pc. It started working, but this time i kept an eye on PSU voltages on hwinfo64. What happened is that it worked well for about 3 hours, then the (+3v) avcc voltage kept going down by about 0.016v per half an hour or so. Then from the initial value of 3.312 it reached around 3,056, then all of a sudden pc shut down (after running it for about 5.5 hours)
Then again I gave it a break for about 12 hours. In the morning i booted it up, immediately noticed on hwmonitor that this time the initial avcc voltage is 2.264 to begin with. This time the voltage kept dropping by 0.016v rather more quickly than befire, and pretty soon it reached the value of 3.056, and a few seconds after, the pc shut down (after running for about 2.5 hours)
This was my hwinfo64 readings during shutdown:
Avcc 3.056 (or lower)/ 3.312
3vcc 3.296/ 3.312
5v : 4.960 (sometimes 4.880)
12v: 12.00v
3vsb 3.056 (this one kept following the avcc value more or less)
Vbat: 3.1+ as far as i remember

I think my psu is faulty. Can someone shed some light on what this avcc voltage is and what it does? Most of the time i just hear about the 12v rail voltage, which looks fine in my case, but the pc shuts down as the avcc reaches a critical value, crossing the acceptable 5% deviation from standard value.
I am not the most knowledgeable person on PSUs. Your help and guidance will be appreciated.
My specs:
Ryzen 5800x cpu
Radeon 6800xt gpu
16gb ddr4 ram
Corsair h100i 240mm liquid cooler
Msi mag x570 tomahawk wifi mobo
6 montech cooling fans
Corsair rm850x shift 850w psu

I dont overclock anything. I also keep my ram xmp disabled.

Last edited: Yesterday at 11:45 AM
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Lutfij

Titan​


Moderator
Oct 7, 200957,1675,585178,440

Welcome to the forums, newcomer!

I think my psu is faulty.
I think you should contact your seller and Corsair to help initiate an RMA. Yes that what you've described above isn't normal. I've noticed a handful of threads and instances on the www that Corsair's Shift series were faulty/failing.

Msi mag x570 tomahawk wifi mobo
BIOS version for your motherboard?
Bios: ami bios
Version: 7C84v1H
Released: 2024-08-09

Also, my shift rmx850 seems to have capacitors with holes in them, is it normal?
View: View: https://imgur.com/a/u6ImyAd


The first 2 are mine, the last one i found on the web, someone was conductinc tests on this psu. The red small ones and the small chocolate colored ones have holes on the top.
I have never seen capacitors with holes on any other psu i had used before, so i am not sure.
 
Last edited:
Nov 10, 2024
4
0
10
Those are not holes. Those are markings from a permanent marker from the quality control of the company.
Thanks. Yes looking closely it turned out that they were indeed marks.
Do u know what avcc voltage is? I cant find much info on the internet, like what it does, what is powers in my desktop and why a low value of this is causing my pc to shut down this way. In most cases i only see posts about the 12v, which looks fine in my case.
Also, the 3vsb voltage follows the avcc value almost perfectly, it also keeps going lower ans lower until pc shuts down.