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PSU Voltage Reading

Last response: in Components
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October 22, 2007 6:33:18 AM

Hello, I have SilverStone Element ST50EFP 500 Watt PSU and I use Speedfan 4.33 to read the voltage. The reading from Speedfan is :

Vcore 1 : 1.30 V
Vcore 2 : 1.90 V
+3.3 V : 3.31 V
+5 V : 4.78 V
+12 V : 2.43 V
-12 V : -16.97 V
-5 V : -4.85 V
+5 V : 5.03 V
Vbat : 3.04 V

Well, the things that I don't understand are :
1. Why are the +5 V have two reading? (in red letter)
2. For +12 V and -12 V, does Speedfan read them incorrectly or my PSU itself doesn't supply enough/exceed the required voltage?
3. What is Vbat? Is it battery voltage? And what is it for?

Thx for all input.

More about : psu voltage reading

October 22, 2007 6:50:52 AM

I'd recommend using a voltmeter for checking your rails. Mine has the exact values on the +/- 12V rails, but gives me 12v with the voltmeter (10v actually since its broken.)
a b ) Power supply
October 22, 2007 7:22:38 AM

The profile for your using likely doesn't match your motherboard. That's why some of the values shown aren't correct. Like someone said, to be absolutely sure you need a volt meter (DMM is the best). At least for the ones that come directly from the PSU.

What motherboard do you have?
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October 22, 2007 7:51:55 AM

techgeek said:
The profile for your using likely doesn't match your motherboard. That's why some of the values shown aren't correct. Like someone said, to be absolutely sure you need a volt meter (DMM is the best). At least for the ones that come directly from the PSU.

What motherboard do you have?


I have Gigabyte GA-965P-S3. A Voltmeter? Wow, do I really need that? DMM? What is that?
October 22, 2007 8:42:14 AM

I assure you your +12V rail is running at least 10.5-11V. If it wasn't your PC wouldn't start properly (video card and CPU would not get enough juice to power up). That doesn't mean it's running within spec, but it is definitely running within +/-10% of 12V. Either +5V reading is within spec, so that doesn't matter. The -5/12V readings are irrelevant in modern PCs.
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