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Bad power supply?

J

jlgrandam

Weaksauce
Joined
Feb 23, 2003
Messages
100
I have a 350W Enermax ps that came with a case I bought like 2 years ago. I wasn't overclocking back then and it worked great. I am trying some overclocking now to prolong the life of this system and I notice that when I run my 2.4C at 3.0 and run Prime95, the 12V rail dips to 11.55V. It idles at 11.88-11.86V. The rest of the rails hold steady where they should be. This is being monitored through Speedfan. Is this cause for alarm? Should I look into a new ps? So far seems pretty stable, I had some issues that I believe were RAM related and now it runs stable.
 
Absolute trust in SpeedFan is cause for alarm. ;)

With my ECS K7VTA3 v. 8 mobo, the +12V rail was reported as:

SpeedFan: +6V or +8V (bounced between them, twice a second)
MBM: 10.6V
multimeter: 12.11V
 
jlgrandam said:
I have a 350W Enermax ps that came with a case I bought like 2 years ago. I wasn't overclocking back then and it worked great. I am trying some overclocking now to prolong the life of this system and I notice that when I run my 2.4C at 3.0 and run Prime95, the 12V rail dips to 11.55V. It idles at 11.88-11.86V. The rest of the rails hold steady where they should be. This is being monitored through Speedfan. Is this cause for alarm? Should I look into a new ps? So far seems pretty stable, I had some issues that I believe were RAM related and now it runs stable.
Click to expand...

Get a DMM. Seriously. :D

Software readings are only as accurate as the motherboard's own built-in monitoring sensors. Such sensors can be off by as much as +/-15% compared to the true DMM reading. Also, motherboard sensors tend to be overly sensitive to even very minor fluctuations in the DC voltage from a PSU. (Software-based readings on my system typically bounced between 11.71V and 11.74V, while my DMM readings on the same system stayed at 12.11V most of the time.)
 
I've seen different temps even between the motherboard BIOS and like the Asus Probe utility, granted it took around a minute to get into the BIOS from being in Windows and Windows does place a load it shouldn't have jumped a half a volt like I have seen.

You can pick up a cheap DMM at any hardware store, generally the RadioShack ones are pretty good. I personally use a Fluke, they are a great investment and will last pratically forever.
 
larrymoencurly said:
Absolute trust in SpeedFan is cause for alarm. ;)

With my ECS K7VTA3 v. 8 mobo, the +12V rail was reported as:

SpeedFan: +6V or +8V (bounced between them, twice a second)
MBM: 10.6V
multimeter: 12.11V
Click to expand...
The remaining socket a boards from ECS/PCChips have been lacking in hardware monitoring in a big way...


I agree with getting a good DMM...
 
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