corsair 750tx voltage fluctuation

[19qoph19]

Is it normal for the rail voltages to change at all. I got the impression it should deliver constant voltages. Another question, are comp psus considered voltage or amp sources?

[RollingThunder]

Is it normal for the rail voltages to change at all. I got the impression it should deliver constant voltages. Another question, are comp psus considered voltage or amp sources?

If you are watching readings from software, ignore them. Check it with a DMM instead.

[19qoph19]

how would I do that under load or get a reading just when its fluctuating?

[RollingThunder]

how would I do that under load or get a reading just when its fluctuating?

Use one of your free molex connectors 12v, run Prime or Orthos and watch your readings.

Look at them first with no load then make the comparison. You can also see the reading difference between software and a DMM reading. Some are close, some are not. What power supply?

[19qoph19]

Thanks. its the 750tx. i dont have a DMM but i'm cuious to know

[RollingThunder]

Thanks. its the 750tx. i dont have a DMM but i'm cuious to know

It's safe and easy to use one to check what you want to know. Use the red lead on a DMM and insert it into the yellow wire (12v). Take the black lead and ground it on a piece of steel. Your case would be ok or something off the case. Unless your power supply is faulty, at idle it won't vary much at all. Under load it may drop .1 or .2v but still read steady. It could range a little more and still be fine.

Example: No load + 12.10v
Under Prime load 11.96v but steady.

As an example, this Corsair HX520 reads 12.09v idle and 11.98v under Prime steady after 10 minutues. That's very good.

[19qoph19]

O.K. a DMM might come in handy. Is there anything else on the computer you can test with the DMM?