Question Regarding 3.3v rail

Apollyon2020 · February 12, 2022

I noticed the 3.3v rail dips under .3 under extreme load and doesn't go back to 3.3v until I release the load. Is this normal? What does the 3.3v rail handle as for powering up the PC? I've been noticing my front USB hub disconnecting and reconnecting for no reason. So I decided to do a stress test to see if it has to do with my PSU. I ran the test for 5 minutes and the PC never crashed. The temps were real hot though.

Here is the temps:

As for my front USB to the case goes, not sure why that keeps disconnecting. I put such a massive load on the system for 5 minutes, and it never crashed. So who knows what the issue is. Just curious about the 3.3v rail and hopefully it's normal dipping under like that. The Corsair iCue software hasn't notified me with any issues to the PSU. Supposedly the software will tell me if the PSU is getting weak. Who knows? lol

--SID-- · February 12, 2022

Brand and model PSU?

Apollyon2020 · February 12, 2022

7 hours ago, --SID-- said:

Brand and model PSU?

Corsair HX1000i

February 12, 2022

A few things here....

1. You have an HX1000i. If you don't want to use iCUE to read actual data, at least use HWInfo. OCCT and monitoring with AIDA64 will not tell you if your PSU is "weak". It will tell you if your board is weak.

2. If you're not actually having a problem, what are you actually looking for?

3. Nothing uses +3.3V any more.

Apollyon2020 · February 12, 2022

16 minutes ago, jonnyGURU said:

A few things here....

1. You have an HX1000i. If you don't want to use iCUE to read actual data, at least use HWInfo. OCCT and monitoring with AIDA64 will not tell you if your PSU is "weak". It will tell you if your board is weak.

2. If you're not actually having a problem, what are you actually looking for?

3. Nothing uses +3.3V any more.

Well I was reading that maybe it 'could' be an issue with my PSU if my front USB ports keep disconnecting and reconnecting for no reason. Well, that's what I read on google. So this is why I went to use OCCT and stress tested my system. The heat that it created was insane. The MOS never reaches 80c, so it was a first time seeing that. I was honestly curious what the 3.3v rail uses. I thought it controlled the I/O to the motherboard. If nothing uses 3.3v rail anymore, then I guess I don't have to worry about it. My assumption the 12v rail is what's being used for everything? Well it never crashed for those 5 minutes of completely being stressed. So thats a plus lol

February 12, 2022

56 minutes ago, Apollyon2020 said:

Well I was reading that maybe it 'could' be an issue with my PSU if my front USB ports keep disconnecting and reconnecting for no reason. Well, that's what I read on google. So this is why I went to use OCCT and stress tested my system. The heat that it created was insane. The MOS never reaches 80c, so it was a first time seeing that. I was honestly curious what the 3.3v rail uses. I thought it controlled the I/O to the motherboard. If nothing uses 3.3v rail anymore, then I guess I don't have to worry about it. My assumption the 12v rail is what's being used for everything? Well it never crashed for those 5 minutes of completely being stressed. So thats a plus lol

USB uses +5V. Not +3.3V.

Apollyon2020 · February 12, 2022

23 minutes ago, jonnyGURU said:

USB uses +5V. Not +3.3V.

Good to know, thanks. Again, I applied load from OCCT for those 5 minutes, and the system was stable. Maybe the front USB port is just dying, and has nothing to do with my system or PSU. Thanks for the help.