Power supply fluctuation

[kwspony]

Realistically, how much fluctuation should there be in a power supply? My 12v rail has dropped to around 5v. I am getting random crash's that I can't figure out as they are always different causes. Now I am wondering about the power supply. Ram memtest and RAM is good. I have 2 SATA drives, 2 DVD drives, floppy, creative x-fi sound card and I am using a 480w power supply.

 

[raybay]

Any power supply that allows the 12V to drop to 5V under load should be replaced... but a 480 Watt unit should be ok. There are power supply testers available for $15 at Outpost, Frys, CompUSA, etc.
What are you using to determine this fluctuation?

 

[kwspony]

A program called Everest.

 

[zipperman]

My tester

Do you happen to have an asus mbd ?
It has Probe to install and check votage.
If not see if your mbd came with a test utility or a download.
Best to use theirs.
The line should stay straight.A slight movement is ok but the voltage
should be close to default shown.

 

[zipperman]

I can't post my attachment here as it's already in this post and more about
this problem
https://www.techspot.com/vb/topic71602.html

It's volts.jpg