Wrong voltage reading in bios?

[DeagleMaster]

In my bios the system voltage 3.3v is 1,664v. What is going on? My motherboard is an msi z170m mortar btw. And my psu is a corsair rm750x.

[Mr.Meerkat]

I wouldn't worry about it too much as voltage readings off motherboards aren't always the most accurate. However, if you really want to be sure, you could always check the voltage on the 3.3v rail with a multimeter/voltmeter. 

[Unimportant]

@DeagleMaster69 You can measure it with a multimeter like @Mr.Meerkat says. Measure between a orange wire and a black wire on the 24-pin motherboard ATX power connector while the pc is running.

 

Altough 1.664V is exactly half of 3.33V. That's too much of a coincidence. Looks more like some poor engineer just made a little mistake in scaling his ADC result correctly.

[Mr.Meerkat]

3 minutes ago, Unimportant said:

while the pc is running.

*while the PSU in on

Regardless, to turn on the PSU, short the green wire with a black wire on the 24 pin with something like a paperclip or something metallic. From there, you'd be able to test the voltage. 

[Unimportant]

Just now, Mr.Meerkat said:

*while the PSU in on

Regardless, to turn on the PSU, short the green wire with a black wire on the 24 pin with something like a paperclip or something metallic. From there, you'd be able to test the voltage. 

If there was really something wrong there's a large chance you'd only see it under load. Many a defective PSU will put out the correct voltage when unloaded but drop when put under load. So it's best to test it in the PC.

 

That's also easier and a lot less work, as you do not have to disconnect anything and can simply backprobe:

 

Make the connections first, putting the probes in before powering on, then there's little that can go wrong.

[DeagleMaster]

14 minutes ago, Unimportant said:

@DeagleMaster69 You can measure it with a multimeter like @Mr.Meerkat says. Measure between a orange wire and a black wire on the 24-pin motherboard ATX power connector while the pc is running.

 

Altough 1.664V is exactly half of 3.33V. That's too much of a coincidence. Looks more like some poor engineer just made a little mistake in scaling his ADC result correctly.

I tought the same thing. I'm not having any stability issues so do you think its nothing to worry about?

[DeagleMaster]

28 minutes ago, Mr.Meerkat said:

I wouldn't worry about it too much as voltage readings off motherboards aren't always the most accurate. However, if you really want to be sure, you could always check the voltage on the 3.3v rail with a multimeter/voltmeter. 

It also quiet wierd that its exactly half of what it is suppose to be.

[Unimportant]

Just now, DeagleMaster69 said:

I'm not having any stability issues so do you think its nothing to worry about?

If it's not broken don't fix it. I would't worry about it.

[DeagleMaster]

6 minutes ago, Unimportant said:

If it's not broken don't fix it. I would't worry about it.

So you think that it gets the voltage its suppose to? The reading was taken in the bios btw.

[Hugs12343]

This occasionally happens. Don't worry, as long as system is stable.

[DeagleMaster]

1 hour ago, Hugs12343 said:

This occasionally happens. Don't worry, as long as system is stable.

What do you mean by occasionally?

[DeagleMaster]

1 hour ago, Hugs12343 said:

This occasionally happens. Don't worry, as long as system is stable.

What do you mean by occasionally?