PSU Voltages Are Strange

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David Wheatley

Honorable
Jul 26, 2013
15
0
10,510
Hi there! I opened up HWMonitor today to notice my PSU Voltages are very odd! I sometimes get random restarts when launching games, and even plugging in USB sticks!

Here are my voltages:
min max
CPUVCORE: 1.032/1.308
VIN1: 1.524/1.524
+3.3V: 2.004/2.016
+5V: 3.367/3.387
+12V: 8.160/8.160
-12V: -8.928/-8.928
-5V: -8.928/-8.298
+5V VCCH: 2.762/2.782
VBAT: 1.524/1.524

I think I might (somewhere) have a short between my -12 and -5 volt rails. But also, the voltages are low (+12v, +3.3v). Have I got a faulty mobo? PSU? CPU? GPU?

Specs:
A6-6400K @ 3.9GHz (no OC)
ASUS GTX750ti OC
GIGABYTE GA-F2A68HM-HD2
 
Solution
InvalidError

When software reports voltages that are over 20% from where they should be, it is practically always incorrect tables in the software. The computer would not be booting at all if the 12V rail was under 10V for real, same goes for 3.3V and 5V. In modern PCs, nothing uses -12V either so whatever voltage might be on that pin ultimately does not matter.

Also, modern PCs/PSUs do not have a -5V rail: if you look at ATX 2.xx PSUs, there is no wire going to that pin, so -8V there is necessarily bogus.

When in doubt, use a multimeter and probe the wires directly instead of blindly believing the bogus values software may throw at you.
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InvalidError

InvalidError

Titan
Moderator
May 18, 2007
23,815
5,265
108,890
The most likely reason for the bogus voltages is simply that HWMonitor has the wrong hardware monitoring chip register map for your motherboard.

For the random restarts, if you suspect the PSU, it would help to specify the brand, model and how old it is.
 
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D

David Wheatley

Honorable
Jul 26, 2013
15
0
10,510


It's 5-6 months old. It's a EVGA 80+ 430W PSU (100-W1-0430-KR)
 
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indsup

Reputable
Apr 26, 2015
432
1
4,960
If your getting low readings and getting random restarts then you more than likely have a bad psu. I would rma the psu and get another one. But before you do just to make sure you don't have an issue with shorts unplug your case ports and see if the voltages/restart problem is any better. If you have a meter you can check that way also but you may end up breadboarding your system to narrow it down.
 
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InvalidError

InvalidError

Titan
Moderator
May 18, 2007
23,815
5,265
108,890

When software reports voltages that are over 20% from where they should be, it is practically always incorrect tables in the software. The computer would not be booting at all if the 12V rail was under 10V for real, same goes for 3.3V and 5V. In modern PCs, nothing uses -12V either so whatever voltage might be on that pin ultimately does not matter.

Also, modern PCs/PSUs do not have a -5V rail: if you look at ATX 2.xx PSUs, there is no wire going to that pin, so -8V there is necessarily bogus.

When in doubt, use a multimeter and probe the wires directly instead of blindly believing the bogus values software may throw at you.
 
Upvote 0 Downvote
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