Low 3.3v

[Brackle]

Not sure if this is safe or not, I was testing some new setting on my I7 920, and I noticed under full 100% load, my 3.3v was very very low

Specs below

Under Full Load below
vcore: 1.2 (set to 1.25v in bios)
3.3v: 3.07v
12v: 11.84
5v: 4.95

Are those volts under full load bad?....should I send in this PSU for RMA?

 

[drescherjm]

If you are reading these voltages from the electronic readings in the BIOS or some other program you have to realize that the sensors are highly inaccurate (also not calibrated) to the point that they are not much value.

 

[Zero82z]

Only a multimeter measuring from a loaded connector can give you accurate voltage readings. I'm sure your PSU is outputting a good voltage since you've got a Signature 850W, which is an excellent unit.

 

[larrymoencurly]

Always measure with a meter. Even one of these $3 (with coupon) Harbor Freight meters will be accurate to < 1% on DC volts:

 

[drescherjm]

I would seriously doubt the accuracy of these. Although they are probably better than the motherboard sensors at least if they are calibrated..

 

[Brackle]

Yea good heads up on the multimeter, Ill go grab one tomarrow.

My 10 year old one from ITT tech cannot be found lol.


Thanks again

 

[larrymoencurly]

I would seriously doubt the accuracy of these. Although they are probably better than the motherboard sensors at least if they are calibrated..

They're pretty accurate. Here are some test results for several digital multimeters, none a Harbor Freight or as cheap:

http://www.robotroom.com/Multimeter-Reviews-5.html

I have three of those cheap Harbor Freight meters (coupons made them free with any purchase, so I had to spend a whopping 88 cents on paint brushes that I didn't need), and they were consistent to within +- 2 counts when I measured a D cell, and they agreed with my Fluke 73 to within 0.2% on DC volts (tried 12V max). When I checked the 120VAC wall outlet, the meters disagreed with my Kill-A-Watt by 1% and 0.6% with my Fluke 73. I also checked the ohms accuracy with 1% resistors from about 300 - 150K ohms, and every reading was within 1% of the marked values.

OTOH I wouldn't use one of these cheap meters on high voltage, and when I stuck the test leads of one of the Harbor Freight meters into an AC outlet, a tip from one of them pulled out of the handle. I pressed it back in and couldn't pull it out again. The outlet was protected by a ground fault interrupter.

 

[Deleted member 133315]

It's out of spec by a tiny bit judging by the readout, you need to hook up a multimeter to it asap and check the correct readings.

If it still comes back as 3.07 with a multimeter, then you will either need to change the psu, or try disconnecting external peripherals from your pc and also try plugging the pc into a different wall socket just to check.

If you use a strip adaptor for powering your pc, unplug your pc from it and plug your pc directly into a wall socket instead.

If it continues to give a low read out, you could still use your pc, but I personally would get it fixed, by either replacing the psu or moving the pc to a different wall socket and stop sharing via strip adaptors.

Saying that, your psu could be perfectly ok and it might be the mobo thats flaky ? or it could just be a wrong readout in the bios software which is really common.

The atx spec for 3.3v is 3.135v at its lowest and 3.465v at its highest, you are just fractionally out of it spec which I doubt would cause any problems, but its best to get it looked at just to make sure.

All the other Voltages that you posted are within spec and wont cause you any problems at present.