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HX520W +5V Rail Voltage Question


v2chrisb

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Greetings,

 

Thanks in advance for taking the time to assist me with my inquiry :biggrin:

 

Last night I replaced a Thermaltake Purepower W0100RU (500W) with the Corsair HX520W and noticed a difference in the +5.0V rail readings being reported in BIOS *and* from Asus' PC Probe software.

 

The PSU *is* plugged in to a brand new Cyberpower 685AVR UPS (rated at 390W). Both the Thermaltake *and* Corsair PSUs were plugged in to this UPS.

 

Please see the data below and please advise. My questions are:

 

1. What should I conclude about the -0.13V difference between the Thermaltake and the Corsair?

 

2. Should I exchange the Corsair, i.e. is the 4.84V within spec?

 

The old Thermaltake Purepower W0100RU:

VCore @ 1.34V

+3.3 rail @ 3.31V

+5.0 rail @ 4.97V

+12.0 rail(s) @ 12.03V

 

The new Corsair HX520W:

VCore @ 1.34V

+3.3 rail @ 3.31

+5.0 rail @ 4.84V

+12.0 rail(s) @ 12.03V

 

Thanks again!

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As long as the +5v rail stays between 4.75v and 5.25v then it is within spec. There may be minor fluctuations between different PSU's however the BIOS and software voltage readings will never be 100% accurate. The only way to know the exact voltages would be to use an electronic VOM.
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Ram Guy,

 

Thanks for the quick response -- greatly appreciated! I understand that the motherboard BIOS isn't the most reliable source to obtain voltages, but speaking candidly, it's still a bit unsettling to spend a good amount on a PSU and only have 0.09v headroom on the +5V rail.

 

Hypothetical question: if my +5V rail falls out of spec in 2 years, will Corsair replace it under warranty?

 

Thanks again for the rapid response. I must say, it's great to be able to "air out" issues on a forum like this! :biggrin:

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I understand that the motherboard BIOS isn't the most reliable source to obtain voltages, but speaking candidly, it's still a bit unsettling to spend a good amount on a PSU and only have 0.09v headroom on the +5V rail.

As Ramguy mentioned you should erase any doubt and test the rails with a $20 DMM from your local Sears, Radio Shack, or other fine establishment. I'd wager that your TT was reading the 5V on the high side.

 

Hypothetical question: if my +5V rail falls out of spec in 2 years, will Corsair replace it under warranty?

Yes.

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I'd like to thank everyone for their excellent advice and assistance!

 

I'm fortunate to work at a technical college, so I'll bring the PSU to the Electrical and Computer Engineering Department and ask them to test the +5V rails. I'll be sure to post the results (probably some time next week).

 

Thanks again!

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Ram Guy,

 

Today a professor from our Electrical Engineering Dept. helped me measure the voltages on my HX520W. Two separate readings on two separate VOMs showed exactly 5.01V. I can rest easily now :D:

 

Thanks again. I'm going to put this beautiful PSU to work now!

 

Cheers!

 

 

--Chris

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